id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2001.03752 | Ephraim Fischbach | M. J. Mueterthies, E. Fischbach, V. E. Barnes, J. Bertaux, D. E.
Krause, and A. Longman | Generalized Analysis of the E\"{o}tv\"{o}s Experiment | 24 pages, 11 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a generalized phenomenological formalism for analyzing the
original E\"{o}tv\"{o}s experiment in the presence of gravity and a generic
"5th force." To date no evidence for a 5th force has emerged since its presence
was suggested by a 1986 reanalysis of the 1922 publication coauthored by
E\"{o}tv\"{o}s, Pek\`ar, and Fekete (EPF). However, our generalized analysis
introduces new mechanisms capable in principle of accounting for the EPF data,
while at the same time avoiding detection by most recent experiments carried
out to date. As an example, some of these mechanisms raise the possibility that
the EPF signal could have arisen from an unexpected direction if it originated
from the motion of the Earth through a medium.
| [
{
"created": "Sat, 11 Jan 2020 13:22:35 GMT",
"version": "v1"
}
] | 2020-01-14 | [
[
"Mueterthies",
"M. J.",
""
],
[
"Fischbach",
"E.",
""
],
[
"Barnes",
"V. E.",
""
],
[
"Bertaux",
"J.",
""
],
[
"Krause",
"D. E.",
""
],
[
"Longman",
"A.",
""
]
] | We present a generalized phenomenological formalism for analyzing the original E\"{o}tv\"{o}s experiment in the presence of gravity and a generic "5th force." To date no evidence for a 5th force has emerged since its presence was suggested by a 1986 reanalysis of the 1922 publication coauthored by E\"{o}tv\"{o}s, Pek\`ar, and Fekete (EPF). However, our generalized analysis introduces new mechanisms capable in principle of accounting for the EPF data, while at the same time avoiding detection by most recent experiments carried out to date. As an example, some of these mechanisms raise the possibility that the EPF signal could have arisen from an unexpected direction if it originated from the motion of the Earth through a medium. |
1111.2034 | Gudrun Heinrich | Gavin Cullen, Nicolas Greiner, Gudrun Heinrich, Gionata Luisoni,
Pierpaolo Mastrolia, Giovanni Ossola, Thomas Reiter, Francesco Tramontano | Automated One-Loop Calculations with GoSam | 32 pages, replaced by published version | Eur. Phys. J. C (2012) 72:1889 | 10.1140/epjc/s10052-012-1889-1 | CERN-PH-TH/2011-272; MPP-2011-132; DESY-11-203; IPPP/11/72;
DCPT/11/144; Edinburgh-2011/32 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the program package GoSam which is designed for the automated
calculation of one-loop amplitudes for multi-particle processes in
renormalisable quantum field theories. The amplitudes, which are generated in
terms of Feynman diagrams, can be reduced using either D-dimensional
integrand-level decomposition or tensor reduction. GoSam can be used to
calculate one-loop QCD and/or electroweak corrections to Standard Model
processes and offers the flexibility to link model files for theories Beyond
the Standard Model. A standard interface to programs calculating real radiation
is also implemented. We demonstrate the flexibility of the program by
presenting examples of processes with up to six external legs attached to the
loop.
| [
{
"created": "Tue, 8 Nov 2011 20:17:49 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Apr 2012 14:39:48 GMT",
"version": "v2"
}
] | 2012-04-06 | [
[
"Cullen",
"Gavin",
""
],
[
"Greiner",
"Nicolas",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Luisoni",
"Gionata",
""
],
[
"Mastrolia",
"Pierpaolo",
""
],
[
"Ossola",
"Giovanni",
""
],
[
"Reiter",
"Thomas",
""
... | We present the program package GoSam which is designed for the automated calculation of one-loop amplitudes for multi-particle processes in renormalisable quantum field theories. The amplitudes, which are generated in terms of Feynman diagrams, can be reduced using either D-dimensional integrand-level decomposition or tensor reduction. GoSam can be used to calculate one-loop QCD and/or electroweak corrections to Standard Model processes and offers the flexibility to link model files for theories Beyond the Standard Model. A standard interface to programs calculating real radiation is also implemented. We demonstrate the flexibility of the program by presenting examples of processes with up to six external legs attached to the loop. |
1503.06156 | Yu Muramatsu | Junji Hisano, Yu Muramatsu, Yuji Omura and Masato Yamanaka | Flavor violating $Z'$ from $SO(10)$ SUSY GUT in High-Scale SUSY | 13 pages, IPMU-15-0030 | null | 10.1016/j.physletb.2015.04.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an $SO(10)$ supersymmetric grand unified theory (SUSY GUT), where
the $SO(10)$ gauge symmetry breaks down to $SU(3)_c \times SU(2)_L \times
U(1)_Y\times U(1)_{X}$ at the GUT scale and $U(1)_X$ is radiatively broken at
the SUSY-braking scale. In order to achieve the observed Higgs mass around
$126$ GeV and also to satisfy constraints on flavor- and/or CP-violating
processes, we assume that the SUSY-breaking scale is $O(100)$ TeV, so that the
$U(1)_X$ breaking scale is also $O(100)$ TeV. One big issue in the SO(10) GUTs
is how to realize realistic Yukawa couplings. In our model, not only ${\bf
16}$-dimensional but also ${\bf 10}$-dimensional matter fields are introduced
to predict the observed fermion masses and mixings. The Standard-Model quarks
and leptons are linear combinations of the ${\bf 16}$- and ${\bf
10}$-dimensional fields so that the $U(1)_{X}$ gauge interaction may be
flavor-violating. We investigate the current constraints on the
flavor-violating $Z'$ interaction from the flavor physics and discuss prospects
for future experiments.
| [
{
"created": "Fri, 20 Mar 2015 16:52:46 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Hisano",
"Junji",
""
],
[
"Muramatsu",
"Yu",
""
],
[
"Omura",
"Yuji",
""
],
[
"Yamanaka",
"Masato",
""
]
] | We propose an $SO(10)$ supersymmetric grand unified theory (SUSY GUT), where the $SO(10)$ gauge symmetry breaks down to $SU(3)_c \times SU(2)_L \times U(1)_Y\times U(1)_{X}$ at the GUT scale and $U(1)_X$ is radiatively broken at the SUSY-braking scale. In order to achieve the observed Higgs mass around $126$ GeV and also to satisfy constraints on flavor- and/or CP-violating processes, we assume that the SUSY-breaking scale is $O(100)$ TeV, so that the $U(1)_X$ breaking scale is also $O(100)$ TeV. One big issue in the SO(10) GUTs is how to realize realistic Yukawa couplings. In our model, not only ${\bf 16}$-dimensional but also ${\bf 10}$-dimensional matter fields are introduced to predict the observed fermion masses and mixings. The Standard-Model quarks and leptons are linear combinations of the ${\bf 16}$- and ${\bf 10}$-dimensional fields so that the $U(1)_{X}$ gauge interaction may be flavor-violating. We investigate the current constraints on the flavor-violating $Z'$ interaction from the flavor physics and discuss prospects for future experiments. |
1004.4565 | Tillmann Heidsieck | Andrzej J. Buras, Bj\"orn Duling, Thorsten Feldmann, Tillmann
Heidsieck, Christoph Promberger, Stefan Recksiegel | The Impact of a 4th Generation on Mixing and CP Violation in the Charm
System | 22 pages, 23 figures, v2 (references added) | JHEP 1007:094,2010 | 10.1007/JHEP07(2010)094 | TUM-HEP-757/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study D0-D0 mixing in the presence of a fourth generation of quarks. In
particular, we calculate the size of the allowed CP violation which is found at
the observable level well beyond anything possible with CKM dynamics. We
calculate the semileptonic asymmetry a_SL and the mixing induced CP asymmetry
eta_fS_f which are correlated with each other. We also investigate the
correlation of eta_fS_f with a number of prominent observables in other mesonic
systems like epsilon'/epsilon, Br(K_L -> pi0 nu nu), Br(K+ -> pi+ nu nu),
Br(B_s ->mu+ mu-), Br(B_d -> mu+ mu-) and finally S_psi phi in the B_s system.
We identify a clear pattern of flavour and CP violation predicted by the SM4
model: While simultaneous large 4G effects in the K and D systems are possible,
accompanying large NP effects in the B_d system are disfavoured. However this
behaviour is not as pronounced as found for the LHT and RSc models. In contrast
to this, sizeable CP violating effects in the B_s system are possible unless
extreme effects in eta_fS_f are found, and Br(B_s ->mu+ mu-) can be strongly
enhanced regardless of the situation in the D system. We find that, on the
other hand, S_psi phi > 0.2 combined with the measured epsilon'/epsilon
significantly diminishes 4G effects within the D system.
| [
{
"created": "Mon, 26 Apr 2010 16:11:07 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2010 16:06:20 GMT",
"version": "v2"
}
] | 2015-03-14 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Duling",
"Björn",
""
],
[
"Feldmann",
"Thorsten",
""
],
[
"Heidsieck",
"Tillmann",
""
],
[
"Promberger",
"Christoph",
""
],
[
"Recksiegel",
"Stefan",
""
]
] | We study D0-D0 mixing in the presence of a fourth generation of quarks. In particular, we calculate the size of the allowed CP violation which is found at the observable level well beyond anything possible with CKM dynamics. We calculate the semileptonic asymmetry a_SL and the mixing induced CP asymmetry eta_fS_f which are correlated with each other. We also investigate the correlation of eta_fS_f with a number of prominent observables in other mesonic systems like epsilon'/epsilon, Br(K_L -> pi0 nu nu), Br(K+ -> pi+ nu nu), Br(B_s ->mu+ mu-), Br(B_d -> mu+ mu-) and finally S_psi phi in the B_s system. We identify a clear pattern of flavour and CP violation predicted by the SM4 model: While simultaneous large 4G effects in the K and D systems are possible, accompanying large NP effects in the B_d system are disfavoured. However this behaviour is not as pronounced as found for the LHT and RSc models. In contrast to this, sizeable CP violating effects in the B_s system are possible unless extreme effects in eta_fS_f are found, and Br(B_s ->mu+ mu-) can be strongly enhanced regardless of the situation in the D system. We find that, on the other hand, S_psi phi > 0.2 combined with the measured epsilon'/epsilon significantly diminishes 4G effects within the D system. |
1403.3397 | Sylvain Fichet | Sylvain Fichet, Bj\"orn Herrmann, Yannick Stoll | A new flavour imprint of SU(5)-like Grand Unification and its LHC
signatures | 6 pages, minor typos fixed, reference added, matches PLB version | null | 10.1016/j.physletb.2015.01.013 | LAPTH-016/14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that the hypothesis of a SU(5)-like supersymmetric Grand Unified
Theory (GUT) implies a generic relation within the flavour structure of up-type
squarks. Contrary to other well-known SU(5) relations between the down-quark
and charged lepton sectors, this relation remains exact in the presence of any
corrections and extra operators. Moreover it remains valid to a good precision
at the electroweak scale, and opens thus new possibilities for testing
SU(5)-like GUTs. We derive the low-energy effective theory of observable light
up-type squarks, that also constitutes a useful tool for squark phenomenology.
We use this effective theory to determine how to test SU(5) relations at the
LHC. Focussing on scenarios with light stops, compatible with Natural SUSY, it
appears that simple tests involving ratios of event rates are sufficient to
test the hypothesis of a SU(5)-like GUT theory. The techniques of charm-tagging
and top-polarimetry are a crucial ingredient of these tests.
| [
{
"created": "Thu, 13 Mar 2014 20:00:33 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2014 13:10:30 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Nov 2014 23:38:09 GMT",
"version": "v3"
},
{
"created": "Mon, 26 Jan 2015 20:54:58 GMT",
"version": "v4"
}
] | 2015-06-19 | [
[
"Fichet",
"Sylvain",
""
],
[
"Herrmann",
"Björn",
""
],
[
"Stoll",
"Yannick",
""
]
] | We point out that the hypothesis of a SU(5)-like supersymmetric Grand Unified Theory (GUT) implies a generic relation within the flavour structure of up-type squarks. Contrary to other well-known SU(5) relations between the down-quark and charged lepton sectors, this relation remains exact in the presence of any corrections and extra operators. Moreover it remains valid to a good precision at the electroweak scale, and opens thus new possibilities for testing SU(5)-like GUTs. We derive the low-energy effective theory of observable light up-type squarks, that also constitutes a useful tool for squark phenomenology. We use this effective theory to determine how to test SU(5) relations at the LHC. Focussing on scenarios with light stops, compatible with Natural SUSY, it appears that simple tests involving ratios of event rates are sufficient to test the hypothesis of a SU(5)-like GUT theory. The techniques of charm-tagging and top-polarimetry are a crucial ingredient of these tests. |
hep-ph/0512322 | Jonathan Sapirstein | G.S. Adkins and J. Sapirstein | Recoil corrections in the hydrogen isoelectronic sequence | null | null | 10.1103/PhysRevA.73.032505 | null | hep-ph | null | A version of the Bethe-Salpeter equation appropriate for calculating recoil
corrections in highly charged hydrogenlike ions is presented. The nucleus is
treated as a scalar particle of charge Z, and the electron treated
relativistically. The known recoil corrections of order $m^2/M(Z\alpha)^4$ are
derived in both this formalism and in NRQED.
| [
{
"created": "Mon, 26 Dec 2005 11:03:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Adkins",
"G. S.",
""
],
[
"Sapirstein",
"J.",
""
]
] | A version of the Bethe-Salpeter equation appropriate for calculating recoil corrections in highly charged hydrogenlike ions is presented. The nucleus is treated as a scalar particle of charge Z, and the electron treated relativistically. The known recoil corrections of order $m^2/M(Z\alpha)^4$ are derived in both this formalism and in NRQED. |
0804.1843 | Yunfei Wu | Yunfei Wu and Da-Xin Zhang | On Unparticles and B\to X_s Missing Energy | 11 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the inclusive decay mode $B\to X_s+{\rm Missing Energy}$ in the
unparticle model, where an unparticle can also serve as the missing energy. We
use the Heavy Quark Effective Theory in the calculation. The analytical result
of the decay width in the free quark limit and that of the differential decay
rate to the order of $1/m_b^2$ are presented. Numerical results of the
inclusive mode show interesting differences from those of the exclusive modes.
Near the lower endpoint region, the $d_{\mathcal U}<2$ unparticle has very
different behavior from the Standard Model particles.
| [
{
"created": "Fri, 11 Apr 2008 07:49:56 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2008 02:25:51 GMT",
"version": "v2"
}
] | 2008-09-25 | [
[
"Wu",
"Yunfei",
""
],
[
"Zhang",
"Da-Xin",
""
]
] | We analyze the inclusive decay mode $B\to X_s+{\rm Missing Energy}$ in the unparticle model, where an unparticle can also serve as the missing energy. We use the Heavy Quark Effective Theory in the calculation. The analytical result of the decay width in the free quark limit and that of the differential decay rate to the order of $1/m_b^2$ are presented. Numerical results of the inclusive mode show interesting differences from those of the exclusive modes. Near the lower endpoint region, the $d_{\mathcal U}<2$ unparticle has very different behavior from the Standard Model particles. |
hep-ph/0108071 | David Smith | Lawrence Hall, Yasunori Nomura, Takemichi Okui, David Smith | SO(10) Unified Theories in Six Dimensions | 25 pages, references added, version to appear in Phys. Rev. D | Phys.Rev.D65:035008,2002 | 10.1103/PhysRevD.65.035008 | UCB-PTH-01/31, LBNL-48728 | hep-ph hep-th | null | We construct supersymmetric models of SO(10) unification in which the gauge
symmetry is broken by orbifold compactification. We find that using boundary
conditions to break the gauge symmetry down to $SU(3)_C \otimes SU(2)_L \otimes
U(1)_Y \otimes U(1)_X$ without leaving unwanted massless states requires at
least two extra dimensions, motivating us to work with 6D orbifolds. SO(10) is
broken by two operations, each of which induces gauge-breaking to either the
Georgi-Glashow, Pati-Salam, or flipped $SU(5) \otimes U(1)$ subgroups;
assigning different unbroken subgroups to the two operations leaves only the
standard model gauge group and $U(1)_X$ unbroken. The models we build employ
extra-dimensional mechanisms for naturally realizing doublet-triplet splitting,
suppressing proton decay, and avoiding unwanted grand-unified fermion mass
relations. We find some tension between being free of anomalies of the 6D bulk,
accommodating a simple mechanism for generating right-handed neutrino masses,
and preserving the precise prediction of the weak mixing angle.
| [
{
"created": "Tue, 7 Aug 2001 22:41:36 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2001 22:52:04 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Oct 2001 14:42:59 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Dec 2001 11:35:16 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Hall",
"Lawrence",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Okui",
"Takemichi",
""
],
[
"Smith",
"David",
""
]
] | We construct supersymmetric models of SO(10) unification in which the gauge symmetry is broken by orbifold compactification. We find that using boundary conditions to break the gauge symmetry down to $SU(3)_C \otimes SU(2)_L \otimes U(1)_Y \otimes U(1)_X$ without leaving unwanted massless states requires at least two extra dimensions, motivating us to work with 6D orbifolds. SO(10) is broken by two operations, each of which induces gauge-breaking to either the Georgi-Glashow, Pati-Salam, or flipped $SU(5) \otimes U(1)$ subgroups; assigning different unbroken subgroups to the two operations leaves only the standard model gauge group and $U(1)_X$ unbroken. The models we build employ extra-dimensional mechanisms for naturally realizing doublet-triplet splitting, suppressing proton decay, and avoiding unwanted grand-unified fermion mass relations. We find some tension between being free of anomalies of the 6D bulk, accommodating a simple mechanism for generating right-handed neutrino masses, and preserving the precise prediction of the weak mixing angle. |
1801.00300 | Da-Xin Zhang | Xian-Zheng Bai, Deshan Yang and Da-Xin Zhang | Goldstone Modes and Clebsch-Gordan Coefficients | 13 pages | null | 10.1016/j.nuclphysb.2018.10.014 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We solve explicitly the Goldstone modes in spontaneously symmetry breaking
models with supersymmetry. We find that, when more than one fields or
representations contribute to the symmetry breaking, there exist identities
among the Clebsch-Gordan coefficients which can be used as consistent checks on
the calculations.
| [
{
"created": "Sun, 31 Dec 2017 15:12:44 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2018 13:32:50 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jun 2018 13:06:36 GMT",
"version": "v3"
}
] | 2018-11-14 | [
[
"Bai",
"Xian-Zheng",
""
],
[
"Yang",
"Deshan",
""
],
[
"Zhang",
"Da-Xin",
""
]
] | We solve explicitly the Goldstone modes in spontaneously symmetry breaking models with supersymmetry. We find that, when more than one fields or representations contribute to the symmetry breaking, there exist identities among the Clebsch-Gordan coefficients which can be used as consistent checks on the calculations. |
2111.14586 | Bhavesh Chauhan | Bhavesh Chauhan, Basudeb Dasgupta, Amol Dighe | Large Energy Singles at JUNO from Atmospheric Neutrinos and Dark Matter | 12 pages, 8 figures | Phys. Rev. D 105, 095035 (2022) | 10.1103/PhysRevD.105.095035 | TIFR/TH/21-20 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Large liquid scintillator detectors, such as JUNO, present a new opportunity
to study neutral current events from the low-energy end of the atmospheric
neutrinos, and possible new physics signals due to light dark matter. We
carefully study the possibility of detecting ``Large Energy Singles'' (LES),
i.e., events with visible scintillation energy $>15$\,MeV, but no other
associated tags. For an effective exposure of 20 kton-yr and considering only
Standard Model physics, we expect the LES sample to contain $\sim40$ events
from scattering on free protons and $\sim 108$ events from interaction with
carbon, from neutral-current interactions of atmospheric neutrinos.
Backgrounds, largely due to $\beta$-decays of cosmogenic isotopes, are shown to
be significant only below 15 MeV visible energy. The LES sample at JUNO can
competitively probe a variety of new physics scenarios, such as boosted dark
matter and annihilation of galactic dark matter to sterile neutrinos.
| [
{
"created": "Mon, 29 Nov 2021 15:19:42 GMT",
"version": "v1"
}
] | 2022-12-06 | [
[
"Chauhan",
"Bhavesh",
""
],
[
"Dasgupta",
"Basudeb",
""
],
[
"Dighe",
"Amol",
""
]
] | Large liquid scintillator detectors, such as JUNO, present a new opportunity to study neutral current events from the low-energy end of the atmospheric neutrinos, and possible new physics signals due to light dark matter. We carefully study the possibility of detecting ``Large Energy Singles'' (LES), i.e., events with visible scintillation energy $>15$\,MeV, but no other associated tags. For an effective exposure of 20 kton-yr and considering only Standard Model physics, we expect the LES sample to contain $\sim40$ events from scattering on free protons and $\sim 108$ events from interaction with carbon, from neutral-current interactions of atmospheric neutrinos. Backgrounds, largely due to $\beta$-decays of cosmogenic isotopes, are shown to be significant only below 15 MeV visible energy. The LES sample at JUNO can competitively probe a variety of new physics scenarios, such as boosted dark matter and annihilation of galactic dark matter to sterile neutrinos. |
1105.0927 | Oscar Wallace Greenberg | O.W. Greenberg | Remarks on a challenge to the relation between $CPT$ and Lorentz
violation | 4 pages | null | null | University of Maryland Preprint PP-11-001 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objection [arXiv:1103.0168] to my theorem [arXiv:hep-ph/0201258] that
violation of $CPT$ symmetry implies violation of Lorentz covariance is based on
a nonlocal model in which time-ordered products are not well defined. I used
covariance of time-ordered products as the condition for Lorentz covariance;
therefore the proposed objection is not relevant to my result.
| [
{
"created": "Wed, 4 May 2011 20:14:29 GMT",
"version": "v1"
}
] | 2011-05-06 | [
[
"Greenberg",
"O. W.",
""
]
] | The objection [arXiv:1103.0168] to my theorem [arXiv:hep-ph/0201258] that violation of $CPT$ symmetry implies violation of Lorentz covariance is based on a nonlocal model in which time-ordered products are not well defined. I used covariance of time-ordered products as the condition for Lorentz covariance; therefore the proposed objection is not relevant to my result. |
hep-ph/9807468 | K. Zuber | K. Zuber | Status and perspectives of neutrino oscillation searches | Inv. Plenary talk at 6th Symp. on Particles, Strings and Cosmology
(PASCOS'98), Boston, March 1998. 8 pages, 5 eps-figures included, needs
sprocl.sty | null | null | null | hep-ph | null | The current status of neutrino oscillation searches with reactors and
accelerators is reviewed. An outlook, especially on future long baseline
neutrino oscillation projects, is given.
| [
{
"created": "Wed, 22 Jul 1998 17:51:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zuber",
"K.",
""
]
] | The current status of neutrino oscillation searches with reactors and accelerators is reviewed. An outlook, especially on future long baseline neutrino oscillation projects, is given. |
1503.00608 | Maxim Dvornikov | Maxim Dvornikov (University of S\~ao Paulo, IZMIRAN, Tomsk State
University) | Galvano-rotational effect induced by electroweak interactions in pulsars | 18 pages in JCAP LaTeX style, 2 tables, 1 eps figure, paper is
significantly revised, title is slightly changed, new sec. 6, devoted to
pulsar kicks, and new appendix are added, several new references are
included, some misprints are corrected, version to be published in JCAP | JCAP05(2015)037 | 10.1088/1475-7516/2015/05/037 | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study electroweakly interacting particles in rotating matter. The
existence of the electric current along the axis of the matter rotation is
predicted in this system. This new galvano-rotational effect is caused by the
parity violating interaction between massless charged particles in the rotating
matter. We start with the exact solution of the Dirac equation for a fermion
involved in the electroweak interaction in the rotating frame. This equation
includes the noninertial effects. Then, using the obtained solution, we derive
the induced electric current which turns out to flow along the rotation axis.
We study the possibility of the appearance of the galvano-rotational effect in
dense matter of compact astrophysical objects. The particular example of
neutron and hypothetical quark stars is discussed. It is shown that, using this
effect, one can expect the generation of toroidal magnetic fields comparable
with poloidal ones in old millisecond pulsars. We also briefly discuss the
generation of the magnetic helicity in these stars. Finally we analyze the
possibility to apply the galvano-rotational effect for the description of the
asymmetric neutrino emission from a neutron star to explain pulsars kicks.
| [
{
"created": "Mon, 2 Mar 2015 16:50:35 GMT",
"version": "v1"
},
{
"created": "Sat, 16 May 2015 17:54:13 GMT",
"version": "v2"
}
] | 2015-05-22 | [
[
"Dvornikov",
"Maxim",
"",
"University of São Paulo, IZMIRAN, Tomsk State\n University"
]
] | We study electroweakly interacting particles in rotating matter. The existence of the electric current along the axis of the matter rotation is predicted in this system. This new galvano-rotational effect is caused by the parity violating interaction between massless charged particles in the rotating matter. We start with the exact solution of the Dirac equation for a fermion involved in the electroweak interaction in the rotating frame. This equation includes the noninertial effects. Then, using the obtained solution, we derive the induced electric current which turns out to flow along the rotation axis. We study the possibility of the appearance of the galvano-rotational effect in dense matter of compact astrophysical objects. The particular example of neutron and hypothetical quark stars is discussed. It is shown that, using this effect, one can expect the generation of toroidal magnetic fields comparable with poloidal ones in old millisecond pulsars. We also briefly discuss the generation of the magnetic helicity in these stars. Finally we analyze the possibility to apply the galvano-rotational effect for the description of the asymmetric neutrino emission from a neutron star to explain pulsars kicks. |
1212.5013 | Keisuke Harigaya | Biplob Bhattacherjee, Debajyoti Choudhury, Keisuke Harigaya, Shigeki
Matsumoto and Mihoko M. Nojiri | Model Independent Analysis of Interactions between Dark Matter and
Various Quarks | 21 pages, 4 figures, v2:some comments are added | JHEP 1304 (2013) 031 | 10.1007/JHEP04(2013)031 | IPMU-12-0232 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present and future expected limits on interactions between dark matter and
various quarks are thoroughly investigated in a model-independent way. In
particular, the constraints on the interactions from the Large Hadron Collider
(LHC) experiment are carefully considered with focusing on mono jet + missing
transverse energy, mono b-jet + missing transverse energy, and top quark(s) +
missing transverse energy channels. Model-independent upper limits (expected
limits) on the cross section times acceptance for non-standard model events are
derived at 7 TeV (8 or 14 TeV) running of the LHC experiment. With assuming
that the dark matter is a singlet real scalar or a singlet Majorana fermion, we
also put constraints on several operators describing its interactions with up,
down, strange, charm, bottom and top quarks. These constraints are compared to
those obtained by cosmological and astrophysical observations of the dark
matter.
| [
{
"created": "Thu, 20 Dec 2012 12:52:34 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Apr 2013 01:09:08 GMT",
"version": "v2"
}
] | 2013-04-22 | [
[
"Bhattacherjee",
"Biplob",
""
],
[
"Choudhury",
"Debajyoti",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Nojiri",
"Mihoko M.",
""
]
] | Present and future expected limits on interactions between dark matter and various quarks are thoroughly investigated in a model-independent way. In particular, the constraints on the interactions from the Large Hadron Collider (LHC) experiment are carefully considered with focusing on mono jet + missing transverse energy, mono b-jet + missing transverse energy, and top quark(s) + missing transverse energy channels. Model-independent upper limits (expected limits) on the cross section times acceptance for non-standard model events are derived at 7 TeV (8 or 14 TeV) running of the LHC experiment. With assuming that the dark matter is a singlet real scalar or a singlet Majorana fermion, we also put constraints on several operators describing its interactions with up, down, strange, charm, bottom and top quarks. These constraints are compared to those obtained by cosmological and astrophysical observations of the dark matter. |
2110.12054 | Jonathan Rosner | Marek Karliner and Jonathan L. Rosner | The doubly charmed strange tetraquark | 4 pages, 5 figures. Material added | null | 10.1103/PhysRevD.105.034020 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The LHCb experiment at CERN has discovered a doubly charmed isoscalar
tetraquark $T_{cc}$ with the quantum numbers of $c c \bar u \bar d$ and mass of
about 3875 MeV/$c^2$, decaying to $D^0 D^0 \pi^+$ through the intermediate
channel $D^{*+} D^0$. We present a study of its strange companions with the
quantum numbers of $c c \bar q \bar s$, where $q = u, d$ and isospin violation
is neglected.
| [
{
"created": "Fri, 22 Oct 2021 20:39:02 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2022 17:48:38 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | The LHCb experiment at CERN has discovered a doubly charmed isoscalar tetraquark $T_{cc}$ with the quantum numbers of $c c \bar u \bar d$ and mass of about 3875 MeV/$c^2$, decaying to $D^0 D^0 \pi^+$ through the intermediate channel $D^{*+} D^0$. We present a study of its strange companions with the quantum numbers of $c c \bar q \bar s$, where $q = u, d$ and isospin violation is neglected. |
1407.7372 | Jean-Philippe Lansberg | J.P. Lansberg | Associated-quarkonium production | 6 pages, 4 figures, 1 table, LaTeX. Proceedings of the XXII.
International Workshop on Deep-Inelastic Scattering and Related Subjects
(DIS2014), 28 April - 2 May 2014, Warsaw, Poland | PoS DIS2014 (2014) 151 | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the growing interest to measure associated-quarkonium production
in a number of channels at the LHC. Whereas back-to-back production of
quarkonium + isolated photon provides a unique way to extract gluon TMDs,
observables such as quarkonium + W/Z can be of great help to better understand
the quarkonium production mechanism as well as to shed light on double-parton
scatterings. Along these lines, we also argue that quarkonium-pair production
is a potentially rich source of information which only has started to be
harvested. Finally, we discuss the relevance of studying the production of
quarkonium + heavy-quark, as e.g. J/psi + charm and Upsilon + non-prompt J/psi.
| [
{
"created": "Mon, 28 Jul 2014 10:20:31 GMT",
"version": "v1"
}
] | 2014-07-29 | [
[
"Lansberg",
"J. P.",
""
]
] | We discuss the growing interest to measure associated-quarkonium production in a number of channels at the LHC. Whereas back-to-back production of quarkonium + isolated photon provides a unique way to extract gluon TMDs, observables such as quarkonium + W/Z can be of great help to better understand the quarkonium production mechanism as well as to shed light on double-parton scatterings. Along these lines, we also argue that quarkonium-pair production is a potentially rich source of information which only has started to be harvested. Finally, we discuss the relevance of studying the production of quarkonium + heavy-quark, as e.g. J/psi + charm and Upsilon + non-prompt J/psi. |
2311.04987 | Sandip Roy | Sandip Roy, Carlos Blanco, Christopher Dessert, Anirudh Prabhu, Tea
Temim | Sensitivity of JWST to eV-Scale Decaying Axion Dark Matter | 7 pages, 2 figures, 4 pages of Supplemental Material (6 figures) | null | null | null | hep-ph astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | The recently-launched James Webb Space Telescope (JWST) can resolve eV-scale
emission lines arising from dark matter (DM) decay. We forecast the
end-of-mission sensitivity to the decay of axions, a leading DM candidate, in
the Milky Way using the blank-sky observations expected during standard
operations. Searching for unassociated emission lines will constrain axions in
the mass range $0.18$ eV to $2.6$ eV with axion-photon couplings
$g_{a\gamma\gamma}\gtrsim 5.5 \times 10^{-12}$ GeV$^{-1}$. In particular, these
results will constrain astrophobic QCD axions to masses $\lesssim$ 0.2 eV.
| [
{
"created": "Wed, 8 Nov 2023 19:05:45 GMT",
"version": "v1"
}
] | 2023-11-10 | [
[
"Roy",
"Sandip",
""
],
[
"Blanco",
"Carlos",
""
],
[
"Dessert",
"Christopher",
""
],
[
"Prabhu",
"Anirudh",
""
],
[
"Temim",
"Tea",
""
]
] | The recently-launched James Webb Space Telescope (JWST) can resolve eV-scale emission lines arising from dark matter (DM) decay. We forecast the end-of-mission sensitivity to the decay of axions, a leading DM candidate, in the Milky Way using the blank-sky observations expected during standard operations. Searching for unassociated emission lines will constrain axions in the mass range $0.18$ eV to $2.6$ eV with axion-photon couplings $g_{a\gamma\gamma}\gtrsim 5.5 \times 10^{-12}$ GeV$^{-1}$. In particular, these results will constrain astrophobic QCD axions to masses $\lesssim$ 0.2 eV. |
2211.08062 | Shi-Ping He | Shi-Ping He | Scalar leptoquark and vector-like quark extended models as the
explanation of the muon $g-2$ anomaly: bottom partner chiral enhancement case | 17 pages, 2 captioned figures, 4 tables. Sequel to the paper
arXiv:2112.13490 [hep-ph]. Add figures to show the $(g-2)_{\mu}$ allowed
regions in the plane of $m_B-m_{\mathrm{LQ}}$. References added. Typos
corrected. Presentation improved. Match the published version in Chinese
Physics C | Chin. Phys. C47 (2023), 073101 | 10.1088/1674-1137/accc1d | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Leptoquark (LQ) models are well motivated solutions to the $(g-2)_{\mu}$
anomaly. In the minimal LQ models, only specific representations can lead to
the chiral enhancements. For the scalar LQs, the $R_2$ and $S_1$ can lead to
the top quark chiral enhancement. For the vector LQs, the $V_2$ and $U_1$ can
lead to the bottom quark chiral enhancement. When we consider the LQ and
vector-like quark (VLQ) simultaneously, there can be more scenarios. In our
previous work, we considered the scalar LQ and VLQ extended models with up-type
quark chiral enhancement. Here, we study the scalar LQ and VLQ extended models
with down-type quark chiral enhancement. We find two new models with $B$ quark
chiral enhancement, which originate from the bottom and bottom partner mixing.
Then, we propose new LQ and VLQ search channels under the constraints of
$(g-2)_{\mu}$.
| [
{
"created": "Tue, 15 Nov 2022 11:29:43 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2023 12:20:49 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"He",
"Shi-Ping",
""
]
] | Leptoquark (LQ) models are well motivated solutions to the $(g-2)_{\mu}$ anomaly. In the minimal LQ models, only specific representations can lead to the chiral enhancements. For the scalar LQs, the $R_2$ and $S_1$ can lead to the top quark chiral enhancement. For the vector LQs, the $V_2$ and $U_1$ can lead to the bottom quark chiral enhancement. When we consider the LQ and vector-like quark (VLQ) simultaneously, there can be more scenarios. In our previous work, we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement. Here, we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement. We find two new models with $B$ quark chiral enhancement, which originate from the bottom and bottom partner mixing. Then, we propose new LQ and VLQ search channels under the constraints of $(g-2)_{\mu}$. |
0805.2116 | Carlos Quimbay | C. Quimbay and J. Morales (Universidad Nacional de Colombia) | Physical vacuum as the source of the standard model particle masses | LATEX, 13 pages, corrected typos | Electron.J.Theor.Phys.8:183-194,2011 | null | FIUN-GCP-08/1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an approach of mass generation for Standard Model particles in
which fermions acquire masses from their interactions with physical vacuum and
gauge bosons acquire masses from charge fluctuations of vacuum. A remarkable
fact of this approach is that left-handed neutrinos are massive because they
have a weak charge. We obtain consistently masses of electroweak gauge bosons
in terms of fermion masses and running coupling constants of strong,
electromagnetic and weak interactions. On the last part of this work we focus
our interest to present some consequences of this approach as for instance we
first show a restriction about the possible number of fermion families. Next we
establish a prediction for top quark mass and finally fix the highest limit for
the summing of the square of neutrino masses.
| [
{
"created": "Wed, 14 May 2008 16:46:45 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2008 22:33:49 GMT",
"version": "v2"
},
{
"created": "Mon, 19 May 2008 18:45:11 GMT",
"version": "v3"
},
{
"created": "Mon, 5 Sep 2011 05:55:14 GMT",
"version": "v4"
}
] | 2011-09-08 | [
[
"Quimbay",
"C.",
"",
"Universidad Nacional de Colombia"
],
[
"Morales",
"J.",
"",
"Universidad Nacional de Colombia"
]
] | We present an approach of mass generation for Standard Model particles in which fermions acquire masses from their interactions with physical vacuum and gauge bosons acquire masses from charge fluctuations of vacuum. A remarkable fact of this approach is that left-handed neutrinos are massive because they have a weak charge. We obtain consistently masses of electroweak gauge bosons in terms of fermion masses and running coupling constants of strong, electromagnetic and weak interactions. On the last part of this work we focus our interest to present some consequences of this approach as for instance we first show a restriction about the possible number of fermion families. Next we establish a prediction for top quark mass and finally fix the highest limit for the summing of the square of neutrino masses. |
2401.00336 | John R. Hiller | A.P. Bray, S.S. Chabysheva, J.R. Hiller | Effective potential between static sources in quenched light-front
Yukawa theory | 19 pages, no figures; RevTeX 4.2 | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We compute a nonperturbative effective potential between two static fermions
in light-front Yukawa theory as a Hamiltonian eigenvalue problem. Fermion pair
production is suppressed, to make possible an exact analytic solution in the
form of a coherent state of bosons that form clouds around the sources. The
effective potential is essentially an interference term between individual
clouds. The model is regulated with Pauli-Villars bosons and fermions, to
achieve consistent quantization and renormalization of masses and couplings.
This extends earlier work on scalar Yukawa theory where Pauli-Villars
regularization did not play a central role. The key result is that the
nonperturbative solution restores rotational symmetry even though the
light-front formulation of Yukawa theory, with its preferred axis, appears
antithetical to such a symmetry.
| [
{
"created": "Sat, 30 Dec 2023 22:14:17 GMT",
"version": "v1"
}
] | 2024-01-02 | [
[
"Bray",
"A. P.",
""
],
[
"Chabysheva",
"S. S.",
""
],
[
"Hiller",
"J. R.",
""
]
] | We compute a nonperturbative effective potential between two static fermions in light-front Yukawa theory as a Hamiltonian eigenvalue problem. Fermion pair production is suppressed, to make possible an exact analytic solution in the form of a coherent state of bosons that form clouds around the sources. The effective potential is essentially an interference term between individual clouds. The model is regulated with Pauli-Villars bosons and fermions, to achieve consistent quantization and renormalization of masses and couplings. This extends earlier work on scalar Yukawa theory where Pauli-Villars regularization did not play a central role. The key result is that the nonperturbative solution restores rotational symmetry even though the light-front formulation of Yukawa theory, with its preferred axis, appears antithetical to such a symmetry. |
2205.11426 | Xuan Chen | Xuan Chen, Thomas Gehrmann, Nigel Glover, Alexander Huss, Tong-Zhi
Yang, Hua Xing Zhu | Transverse Mass Distribution and Charge Asymmetry in W Boson Production
to Third Order in QCD | 5 pages, 4 figures. Add data files for each plot | Phys.Lett.B 840 (2023) 137876 | 10.1016/j.physletb.2023.137876 | IPPP/22/32, ZU-TH 19/22, P3H-22-055, KA-TP-15-2022, CERN-TH-2022-083 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Charged gauge boson production at hadron colliders is a fundamental benchmark
for the extraction of electroweak parameters and the understanding of the
proton structure. To enable precision phenomenology for this process, we
compute the third-order (N$^3$LO) QCD corrections to the rapidity distribution
and charge asymmetry in W boson production and to the transverse mass
distribution of its decay products. Our results display substantial QCD
corrections in kinematic regions relevant for Tevatron and LHC measurements. We
compare the numerical magnitude of the N$^3$LO corrections with uncertainties
from electroweak input parameters and quantify their potential impact on the
determination of the W boson mass.
| [
{
"created": "Mon, 23 May 2022 16:13:23 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2022 21:07:30 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Apr 2023 11:48:20 GMT",
"version": "v3"
}
] | 2023-04-17 | [
[
"Chen",
"Xuan",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Glover",
"Nigel",
""
],
[
"Huss",
"Alexander",
""
],
[
"Yang",
"Tong-Zhi",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | Charged gauge boson production at hadron colliders is a fundamental benchmark for the extraction of electroweak parameters and the understanding of the proton structure. To enable precision phenomenology for this process, we compute the third-order (N$^3$LO) QCD corrections to the rapidity distribution and charge asymmetry in W boson production and to the transverse mass distribution of its decay products. Our results display substantial QCD corrections in kinematic regions relevant for Tevatron and LHC measurements. We compare the numerical magnitude of the N$^3$LO corrections with uncertainties from electroweak input parameters and quantify their potential impact on the determination of the W boson mass. |
1706.04904 | C. A. de S. Pires | J. G. Ferreira Jr, C. A. de S. Pires, P. S. Rodrigues da Silva,
Clarissa Siqueira | On the Higgs-like boson in the Minimal Supersymmetric 3-3-1 Model | 20 pages, 10 figures | null | 10.1140/epjc/s10052-018-5705-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is imperative that any proposal of new physics possesses a Higgs-like
boson with 125 GeV of mass and couplings with the standard particles that
recover the branching ratios and signal strengths as measured by CMS and ATLAS.
We address this issue within the supersymmetric version of the minimal 3-3-1
model. For this we develop the Higgs potential with focus on the lightest Higgs
provided by the model. Our proposal is to verify if it recovers the properties
of the standard Higgs. With respect to its mass, we calculate it up to one loop
level by taking into account all contributions provided by the model. In regard
to its couplings, we restrict our investigation to couplings of the Higgs-like
boson with the standard particles, only. We then calculate the dominant
branching ratios and the respective signal strengths and confront our results
with the recent measurements of CMS and ATLAS. As distinctive aspects, we
remark that our Higgs-like boson intermediates flavor changing neutral
processes and then argue that its signature is the decay $t \rightarrow h+c$.
We calculate its branching ratio and compare it with current bounds. We also
show that the potential is stable for the region of parameter space employed in
our calculations.
| [
{
"created": "Thu, 15 Jun 2017 14:50:24 GMT",
"version": "v1"
}
] | 2018-04-18 | [
[
"Ferreira",
"J. G.",
"Jr"
],
[
"Pires",
"C. A. de S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
],
[
"Siqueira",
"Clarissa",
""
]
] | It is imperative that any proposal of new physics possesses a Higgs-like boson with 125 GeV of mass and couplings with the standard particles that recover the branching ratios and signal strengths as measured by CMS and ATLAS. We address this issue within the supersymmetric version of the minimal 3-3-1 model. For this we develop the Higgs potential with focus on the lightest Higgs provided by the model. Our proposal is to verify if it recovers the properties of the standard Higgs. With respect to its mass, we calculate it up to one loop level by taking into account all contributions provided by the model. In regard to its couplings, we restrict our investigation to couplings of the Higgs-like boson with the standard particles, only. We then calculate the dominant branching ratios and the respective signal strengths and confront our results with the recent measurements of CMS and ATLAS. As distinctive aspects, we remark that our Higgs-like boson intermediates flavor changing neutral processes and then argue that its signature is the decay $t \rightarrow h+c$. We calculate its branching ratio and compare it with current bounds. We also show that the potential is stable for the region of parameter space employed in our calculations. |
hep-ph/0002221 | R. Floreanini | F. Benatti and R. Floreanini | Open system approach to neutrino oscillations | 15 pages, plain-TeX, to appear in JHEP | JHEP 0002 (2000) 032 | 10.1088/1126-6708/2000/02/032 | null | hep-ph | null | Neutrino oscillations are studied in the general framework of open quantum
systems by means of extended dynamics that take into account possible
dissipative effects. These new phenomena induce modifications in the neutrino
oscillation pattern that in general can be parametrized by means of six
phenomenological constants. Although very small, stringent bounds on these
parameters are likely to be given by future planned neutrino experiments.
| [
{
"created": "Mon, 21 Feb 2000 16:49:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Benatti",
"F.",
""
],
[
"Floreanini",
"R.",
""
]
] | Neutrino oscillations are studied in the general framework of open quantum systems by means of extended dynamics that take into account possible dissipative effects. These new phenomena induce modifications in the neutrino oscillation pattern that in general can be parametrized by means of six phenomenological constants. Although very small, stringent bounds on these parameters are likely to be given by future planned neutrino experiments. |
1108.6163 | Mieczyslaw Witold Krasny | Mieczyslaw Witold Krasny | Ascertaining the origin of the $l\nu l\nu$ excess events at the LHC by a
change of beam energy | 10 pages, 4 figures, version 2: Fig. 1 removed to comply with the
ATLAS policy rules | Acta Physica Polonica B vol. 42 (2011) page 2133 | 10.5506/APhysPolB.42.2133 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A higher than predicted rate of two leptons plus missing transverse energy
events, reported at the summer HEP conferences, can originate from a decay of
the Higgs boson into a $WW^{(*)}$ pair, a misjudgement of the rate of SM
background processes or a statistical fluctuation. In this paper we discuss a
way to resolve this three-fold ambiguity.
| [
{
"created": "Wed, 31 Aug 2011 08:54:07 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 12:23:37 GMT",
"version": "v2"
}
] | 2011-11-11 | [
[
"Krasny",
"Mieczyslaw Witold",
""
]
] | A higher than predicted rate of two leptons plus missing transverse energy events, reported at the summer HEP conferences, can originate from a decay of the Higgs boson into a $WW^{(*)}$ pair, a misjudgement of the rate of SM background processes or a statistical fluctuation. In this paper we discuss a way to resolve this three-fold ambiguity. |
hep-ph/0602025 | Bennie F. L. Ward | B.F.L. Ward (1) ((1) Department of Physics, Baylor University, Waco,
TX, USA) | New Applications of Resummation in Non-Abelian Gauge Theories: QED X QCD
Exponentiation for LHC Physics, IR-Improved DGLAP Theory and Resummed Quantum
Gravity | 6 pages, 2 figures, presented at RADCOR05, Kanagawa, Japan, Oct.,
2005 | Nucl.Phys.Proc.Suppl.157:215-220,2006 | 10.1016/j.nuclphysbps.2006.03.023 | BU-HEPP-06-04 | hep-ph | null | We present the elements of three applications of resummation methods in
non-Abelian gauge theories: (1), QED X QCD exponentiation and shower/ME
matching for LHC physics; (2), IR improvement of DGLAP theory; (3), resummed
quantum gravity and the final state of Hawking radiation. In all cases, the
extension of the YFS approach, originally introduced for Abelian gauge theory,
to non-Abelian gauge theories, QCD and quantum general relativity, leads to new
results and solutions which we briefly summarize.
| [
{
"created": "Thu, 2 Feb 2006 18:39:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ward",
"B. F. L.",
""
]
] | We present the elements of three applications of resummation methods in non-Abelian gauge theories: (1), QED X QCD exponentiation and shower/ME matching for LHC physics; (2), IR improvement of DGLAP theory; (3), resummed quantum gravity and the final state of Hawking radiation. In all cases, the extension of the YFS approach, originally introduced for Abelian gauge theory, to non-Abelian gauge theories, QCD and quantum general relativity, leads to new results and solutions which we briefly summarize. |
hep-ph/0008207 | Ralf Rapp | R. Rapp, E. Shuryak and I. Zahed | A chiral crystal in cold QCD matter at intermediate densities? | 14 pages ReVTeX, including 11 ps-/eps-figures | Phys.Rev. D63 (2001) 034008 | 10.1103/PhysRevD.63.034008 | SUNY-NTG-00-40 | hep-ph nucl-th | null | The analogue of Overhauser (particle-hole) pairing in electronic systems
(spin-density waves with non-zero total momentum $Q$) is analyzed in
finite-density QCD for 3 colors and 2 flavors, and compared to the
color-superconducting BCS ground state (particle-particle pairing, $Q$=0). The
calculations are based on effective nonperturbative four-fermion interactions
acting in both the scalar diquark as well as the scalar-isoscalar quark-hole
('$\sigma$') channel. Within the Nambu-Gorkov formalism we set up the coupled
channel problem including multiple chiral density wave formation, and evaluate
the resulting gaps and free energies. Employing medium-modified
instanton-induced 't Hooft interactions, as applicable around $\mu_q\simeq 0.4$
GeV (or 4 times nuclear saturation density), we find the 'chiral crystal phase'
to be competitive with the color superconductor.
| [
{
"created": "Fri, 18 Aug 2000 19:29:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rapp",
"R.",
""
],
[
"Shuryak",
"E.",
""
],
[
"Zahed",
"I.",
""
]
] | The analogue of Overhauser (particle-hole) pairing in electronic systems (spin-density waves with non-zero total momentum $Q$) is analyzed in finite-density QCD for 3 colors and 2 flavors, and compared to the color-superconducting BCS ground state (particle-particle pairing, $Q$=0). The calculations are based on effective nonperturbative four-fermion interactions acting in both the scalar diquark as well as the scalar-isoscalar quark-hole ('$\sigma$') channel. Within the Nambu-Gorkov formalism we set up the coupled channel problem including multiple chiral density wave formation, and evaluate the resulting gaps and free energies. Employing medium-modified instanton-induced 't Hooft interactions, as applicable around $\mu_q\simeq 0.4$ GeV (or 4 times nuclear saturation density), we find the 'chiral crystal phase' to be competitive with the color superconductor. |
hep-ph/9909333 | Bhaskar Dutta | E. Accomando, R. Arnowitt and B. Dutta | CP Violating Phases, Nonuniversal Soft Breaking And D-brane Models | 18 pages, latex, 11 figures | Phys.Rev.D61:075010,2000 | 10.1103/PhysRevD.61.075010 | CTP-TAMU-34-99 | hep-ph hep-th | null | The question of CP violating phases and electric dipole moments (EDMs)for the
electron ($d_e$) and the neutron ($d_n$) for supergravity models with
nonuniversal soft breaking is considered for models with a light
($\stackrel{<}{\sim}$1 TeV) mass spectrum and R-parity invariance. As with
models with universal soft breaking (mSUGRA) one finds a serious fine tuning
problem generally arises for $\theta_{0B}$ (the phase of the B soft breaking
parameter at the GUT scale), if the experimental EDM constraints are obeyed and
radiative breaking of $SU(2)_L\times U(1)_Y$ occurs. A D-brane model where
$SU(3)_C\times U(1)_Y$ is associated with one set of 5-branes and $SU(2)_L$
with another intersecting set of 5-branes is examined, and the cancellation
phenomena is studied over the parameter space of the model. Large values of
$\theta_B$ (the phase of B at the electroweak scale) can be accommodated,
though again $\theta_{0B}$ must be fine tuned. Using the conventional
prescription for calculating $d_n$, one finds the region in parameter space
where the experimental EDM constraints on both $d_e$ and $d_n$ hold is
significantly reduced, and generally requires tan$\beta\stackrel{<}{\sim}$5 for
most of the parameter space, though there are small allowed regions even for
tan$\beta\stackrel{>}{\sim}$10. We find the Weinberg three gluon term generally
makes significant contributions, and results are sensitive to the values of
quark masses.
| [
{
"created": "Sun, 12 Sep 1999 20:50:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Accomando",
"E.",
""
],
[
"Arnowitt",
"R.",
""
],
[
"Dutta",
"B.",
""
]
] | The question of CP violating phases and electric dipole moments (EDMs)for the electron ($d_e$) and the neutron ($d_n$) for supergravity models with nonuniversal soft breaking is considered for models with a light ($\stackrel{<}{\sim}$1 TeV) mass spectrum and R-parity invariance. As with models with universal soft breaking (mSUGRA) one finds a serious fine tuning problem generally arises for $\theta_{0B}$ (the phase of the B soft breaking parameter at the GUT scale), if the experimental EDM constraints are obeyed and radiative breaking of $SU(2)_L\times U(1)_Y$ occurs. A D-brane model where $SU(3)_C\times U(1)_Y$ is associated with one set of 5-branes and $SU(2)_L$ with another intersecting set of 5-branes is examined, and the cancellation phenomena is studied over the parameter space of the model. Large values of $\theta_B$ (the phase of B at the electroweak scale) can be accommodated, though again $\theta_{0B}$ must be fine tuned. Using the conventional prescription for calculating $d_n$, one finds the region in parameter space where the experimental EDM constraints on both $d_e$ and $d_n$ hold is significantly reduced, and generally requires tan$\beta\stackrel{<}{\sim}$5 for most of the parameter space, though there are small allowed regions even for tan$\beta\stackrel{>}{\sim}$10. We find the Weinberg three gluon term generally makes significant contributions, and results are sensitive to the values of quark masses. |
hep-ph/0308289 | Armen Oganesian | A. Oganesian (ITEP) | Reanalysis of QCD sum rules for nucleon with perturbative correction | 9 pages, 3epsf figures included | null | null | null | hep-ph | null | A new analysis of baryon sum rules is done with modern values of parameters
and known perturbative corrections. The restriction for gluon and quark
condensates and the new value of nucleon coupling constant are found.
| [
{
"created": "Thu, 28 Aug 2003 01:45:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Oganesian",
"A.",
"",
"ITEP"
]
] | A new analysis of baryon sum rules is done with modern values of parameters and known perturbative corrections. The restriction for gluon and quark condensates and the new value of nucleon coupling constant are found. |
1101.2310 | Valeriy Nazaruk | V.I.Nazaruk | On the critical examination of the "field-theoretical approach" to the
neutron-antineutron oscillations in nuclei | 7 pages, 2 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly outline the models of the $n\bar{n}$ transition in nuclei and
analyse a well known calculation based on diagram technique published in 1992
and repeated recently by V. Kopeliovich and I. Potashnikova.
| [
{
"created": "Wed, 12 Jan 2011 10:09:59 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2011 09:59:23 GMT",
"version": "v2"
}
] | 2011-02-08 | [
[
"Nazaruk",
"V. I.",
""
]
] | We briefly outline the models of the $n\bar{n}$ transition in nuclei and analyse a well known calculation based on diagram technique published in 1992 and repeated recently by V. Kopeliovich and I. Potashnikova. |
2210.17148 | Qi-Fang L\"u | Ning Li, Hui-Zhen He, Wei Liang, Qi-Fang L\"u, Dian-Yong Chen, Yu-Bing
Dong | Light meson emissions of the selected charmonium-like states within
compact tetraquark configurations | 10 pages, 4 figures, to be published in Chinese Physics C | null | 10.1088/1674-1137/acc648 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We adopt the quark pair creation model to investigate the light meson
emissions of several charmonium-like states. The quark pair creation model is
applied to the four-body systems, and we calculate the pion/kaon emissions of
the $X(4700)$, $Z_c(4430)$, $Y(4230)$, $Y(4360)$, $Y(4390)$ and $Y(4660)$
within the compact tetraquark assumptions. It is found that the pion/kaon decay
widths for the $X(4700)$ and $Z_c(4430)$ are relatively small, while the
partial decay widths for the resonances $Y(4230)$, $Y(4360)$, $Y(4390)$ and
$Y(4660)$ are significant. We expect that our exploration of these decay
behaviors can provide useful information for future experimental searches and
theoretical interpretations.
| [
{
"created": "Mon, 31 Oct 2022 08:59:55 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2023 11:57:30 GMT",
"version": "v2"
}
] | 2023-06-07 | [
[
"Li",
"Ning",
""
],
[
"He",
"Hui-Zhen",
""
],
[
"Liang",
"Wei",
""
],
[
"Lü",
"Qi-Fang",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Dong",
"Yu-Bing",
""
]
] | We adopt the quark pair creation model to investigate the light meson emissions of several charmonium-like states. The quark pair creation model is applied to the four-body systems, and we calculate the pion/kaon emissions of the $X(4700)$, $Z_c(4430)$, $Y(4230)$, $Y(4360)$, $Y(4390)$ and $Y(4660)$ within the compact tetraquark assumptions. It is found that the pion/kaon decay widths for the $X(4700)$ and $Z_c(4430)$ are relatively small, while the partial decay widths for the resonances $Y(4230)$, $Y(4360)$, $Y(4390)$ and $Y(4660)$ are significant. We expect that our exploration of these decay behaviors can provide useful information for future experimental searches and theoretical interpretations. |
2105.14317 | Yu-xin Liu | Ling-feng Chen, Zhan Bai, Fei Gao, and Yu-xin Liu | New insight on the quark condensate beyond chiral limit | 7 pages, 5 figures | Phys. Rev. D 104, 094041 (2021) | 10.1103/PhysRevD.104.094041 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | With analyzing the mass function obtained by solving Dyson-Schwinger
Equations, we propose a cut-off independent definition of quark condensate
beyond chiral limit. With this well-defined condensate, we then analyze the
evolution of the condensate and its susceptibility with the current quark mass.
The susceptibility shows a critical mass in the neighborhood of the s-quark
current mass, which defines a transition boundary for internal hadron dynamics.
| [
{
"created": "Sat, 29 May 2021 14:51:06 GMT",
"version": "v1"
}
] | 2023-05-29 | [
[
"Chen",
"Ling-feng",
""
],
[
"Bai",
"Zhan",
""
],
[
"Gao",
"Fei",
""
],
[
"Liu",
"Yu-xin",
""
]
] | With analyzing the mass function obtained by solving Dyson-Schwinger Equations, we propose a cut-off independent definition of quark condensate beyond chiral limit. With this well-defined condensate, we then analyze the evolution of the condensate and its susceptibility with the current quark mass. The susceptibility shows a critical mass in the neighborhood of the s-quark current mass, which defines a transition boundary for internal hadron dynamics. |
1211.5305 | Michal Praszalowicz | Michal Praszalowicz and Tomasz Stebel | Quantitative Study of Geometrical Scaling in Deep Inelastic Scattering
at HERA | 18 pages, 11 figures, version accepted in JHEP, new discussion of
experimental errors | null | 10.1007/JHEP03(2013)090 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method to assess the quality of geometrical scaling in Deep
Inelastic Scattering and apply it to the combined HERA data on $\gamma^{\ast}p$
cross-section. Using two different approaches based on Bjorken $x$ binning and
binning in $\gamma^{\ast}p$ scattering energy $W$, we show that geometrical
scaling in variable $\tau\sim Q^{2} x^{\lambda}$ works well up to Bjorken $x$'s
0.1. The corresponding value of exponent $\lambda$ is 0.32 -- 0.34.
| [
{
"created": "Thu, 22 Nov 2012 15:12:18 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 18:19:16 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Praszalowicz",
"Michal",
""
],
[
"Stebel",
"Tomasz",
""
]
] | We propose a method to assess the quality of geometrical scaling in Deep Inelastic Scattering and apply it to the combined HERA data on $\gamma^{\ast}p$ cross-section. Using two different approaches based on Bjorken $x$ binning and binning in $\gamma^{\ast}p$ scattering energy $W$, we show that geometrical scaling in variable $\tau\sim Q^{2} x^{\lambda}$ works well up to Bjorken $x$'s 0.1. The corresponding value of exponent $\lambda$ is 0.32 -- 0.34. |
2104.14831 | SungWoo Youn | Yannis K. Semertzidis and SungWoo Youn | Axion Dark Matter: How to see it? | 22 pages, 7 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The axion is a highly motivated elementary particle which could address two
fundamental questions in physics - the strong CP problem and the dark matter
mystery. Experimental searches for this hypothetical particle have started to
reach theoretically interesting sensitivity levels, particularly in the $\mu$eV
(GHz) region. They rely on large volume solenoid magnetic fields and microwave
resonators with signals read out by quantum noise limited amplifiers.
Concurrently, there have been intensive experimental efforts to widen the
search range by devising various techniques as well as to enhance sensitivities
by implementing advanced technologies. The developments and improvements in
these orthogonal approaches will enable us to explore most of the parameter
space of the axion and axion-like particles within the next couple of decades,
with the 1-25 GHz frequency range to be conquered well within the first decade.
We review the experimental aspects of axion physics and discuss the past,
present and future of the direct search programs.
| [
{
"created": "Fri, 30 Apr 2021 08:25:07 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2021 01:19:24 GMT",
"version": "v2"
}
] | 2021-10-28 | [
[
"Semertzidis",
"Yannis K.",
""
],
[
"Youn",
"SungWoo",
""
]
] | The axion is a highly motivated elementary particle which could address two fundamental questions in physics - the strong CP problem and the dark matter mystery. Experimental searches for this hypothetical particle have started to reach theoretically interesting sensitivity levels, particularly in the $\mu$eV (GHz) region. They rely on large volume solenoid magnetic fields and microwave resonators with signals read out by quantum noise limited amplifiers. Concurrently, there have been intensive experimental efforts to widen the search range by devising various techniques as well as to enhance sensitivities by implementing advanced technologies. The developments and improvements in these orthogonal approaches will enable us to explore most of the parameter space of the axion and axion-like particles within the next couple of decades, with the 1-25 GHz frequency range to be conquered well within the first decade. We review the experimental aspects of axion physics and discuss the past, present and future of the direct search programs. |
1804.04930 | Giorgio Arcadi | Giorgio Arcadi | 2HDM portal for Singlet-Doublet Dark Matter | 24 pages, 8 figures | null | 10.1140/epjc/s10052-018-6327-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extensive analysis of a model in which the (Majorana) Dark
Matter candidate is a mixture between a SU(2) singlet and two SU(2) doublets.
This kind of setup takes the name of singlet-doublet model. We will investigate
in detail an extension of this model in which the Dark Matter sector
interactions with a 2-doublet Higgs sector enforcing the complementarity
between Dark Matter phenomenology and searches of extra Higgs bosons.
| [
{
"created": "Fri, 13 Apr 2018 13:20:20 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Arcadi",
"Giorgio",
""
]
] | We present an extensive analysis of a model in which the (Majorana) Dark Matter candidate is a mixture between a SU(2) singlet and two SU(2) doublets. This kind of setup takes the name of singlet-doublet model. We will investigate in detail an extension of this model in which the Dark Matter sector interactions with a 2-doublet Higgs sector enforcing the complementarity between Dark Matter phenomenology and searches of extra Higgs bosons. |
hep-ph/9303271 | Herbert Weigel | U. Z\"uckert, R. Alkofer, H. Reinhardt and H. Weigel | The Chiral Soliton of the Nambu Jona-Lasinio Model with Vector and Axial
Vector Mesons | 23 pages LaTeX 4 figures (not included, available upon request),
UNIT\"U-THEP-1/1993 | Nucl.Phys.A570:445-471,1994 | 10.1016/0375-9474(94)90068-X | null | hep-ph | null | The self-consistent chiral soliton of the Nambu--Jona-Lasinio model including
the $\omega,\rho$ and $a_1$ (axial-) vector meson fields besides the chiral
angle is investigated. The resulting energy spectrum of the one particle Dirac
Hamiltonian is strongly distorted leading to a polarized Dirac sea which
carries the complete baryon number. This supports Witten's conjecture that
baryons can be described as topological solitons. The exploration of the
isoscalar mean squared radius of the nucleon exhibits that the repulsive
character of the isoscalar vector field $\omega$ as well as the attractive
features of the (axial-) vector mesons $\rho$ and $a_1$ are reproduced in the
Nambu--Jona-Lasinio model. The axial charge of the nucleon $g_A$ comes out far
too small. This can be understood as an artifact of the proper time
regularization prescription.
| [
{
"created": "Wed, 17 Mar 1993 18:31:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zückert",
"U.",
""
],
[
"Alkofer",
"R.",
""
],
[
"Reinhardt",
"H.",
""
],
[
"Weigel",
"H.",
""
]
] | The self-consistent chiral soliton of the Nambu--Jona-Lasinio model including the $\omega,\rho$ and $a_1$ (axial-) vector meson fields besides the chiral angle is investigated. The resulting energy spectrum of the one particle Dirac Hamiltonian is strongly distorted leading to a polarized Dirac sea which carries the complete baryon number. This supports Witten's conjecture that baryons can be described as topological solitons. The exploration of the isoscalar mean squared radius of the nucleon exhibits that the repulsive character of the isoscalar vector field $\omega$ as well as the attractive features of the (axial-) vector mesons $\rho$ and $a_1$ are reproduced in the Nambu--Jona-Lasinio model. The axial charge of the nucleon $g_A$ comes out far too small. This can be understood as an artifact of the proper time regularization prescription. |
1611.10306 | Jean-Philippe Lansberg | Jean-Philippe Lansberg, Hua-Sheng Shao | J/psi+Z production at the LHC | 6 pages, 6 figures, LaTeX uses webofc.cls and woc.bst (provided).
Proceedings of the XIIth Quark Confinement and the Hadron Spectrum
Conference, 28 August - 4 September 2016, Thessaloniki, Greece | null | 10.1051/epjconf/201713706013 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review recent results which we have obtained in the study of
J/psi+Z production at the LHC. Considering our NLO computation in the Colour
Evaporation Model (CEM) as an upper theory limit for the
single-parton-scattering contributions, we claim that the existing data set
from ATLAS points at a dominant double-parton-scattering contribution with an
effective cross section smaller than that for jet-related observables. As a
side product of our analysis, we have computed, for the first time, the
one-loop QCD corrections to the J/psi P_T-differential cross section in the
CEM.
| [
{
"created": "Wed, 30 Nov 2016 18:49:53 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | We briefly review recent results which we have obtained in the study of J/psi+Z production at the LHC. Considering our NLO computation in the Colour Evaporation Model (CEM) as an upper theory limit for the single-parton-scattering contributions, we claim that the existing data set from ATLAS points at a dominant double-parton-scattering contribution with an effective cross section smaller than that for jet-related observables. As a side product of our analysis, we have computed, for the first time, the one-loop QCD corrections to the J/psi P_T-differential cross section in the CEM. |
hep-ph/0210059 | Kurt Haller | Kurt Haller, Hai-cang Ren | Gauge equivalence in QCD: the Weyl and Coulomb gauges | 25 pages | null | 10.1103/PhysRevD.68.085002 | null | hep-ph hep-th | null | The Weyl-gauge ($A_0^a=0)$ QCD Hamiltonian is unitarily transformed to a
representation in which it is expressed entirely in terms of gauge-invariant
quark and gluon fields. In a subspace of gauge-invariant states we have
constructed that implement the non-Abelian Gauss's law, this unitarily
transformed Weyl-gauge Hamiltonian can be further transformed and, under
appropriate circumstances, can be identified with the QCD Hamiltonian in the
Coulomb gauge. We demonstrate an isomorphism that materially facilitates the
application of this Hamiltonian to a variety of physical processes, including
the evaluation of $S$-matrix elements. This isomorphism relates the
gauge-invariant representation of the Hamiltonian and the required set of
gauge-invariant states to a Hamiltonian of the same functional form but
dependent on ordinary unconstrained Weyl-gauge fields operating within a space
of ``standard'' perturbative states. The fact that the gauge-invariant
chromoelectric field is not hermitian has important implications for the
functional form of the Hamiltonian finally obtained. When this nonhermiticity
is taken into account, the ``extra'' vertices in Christ and Lee's Coulomb-gauge
Hamiltonian are natural outgrowths of the formalism. When this nonhermiticity
is neglected, the Hamiltonian used in the earlier work of Gribov and others
results.
| [
{
"created": "Thu, 3 Oct 2002 13:44:29 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2003 19:40:07 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jul 2003 18:21:18 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Haller",
"Kurt",
""
],
[
"Ren",
"Hai-cang",
""
]
] | The Weyl-gauge ($A_0^a=0)$ QCD Hamiltonian is unitarily transformed to a representation in which it is expressed entirely in terms of gauge-invariant quark and gluon fields. In a subspace of gauge-invariant states we have constructed that implement the non-Abelian Gauss's law, this unitarily transformed Weyl-gauge Hamiltonian can be further transformed and, under appropriate circumstances, can be identified with the QCD Hamiltonian in the Coulomb gauge. We demonstrate an isomorphism that materially facilitates the application of this Hamiltonian to a variety of physical processes, including the evaluation of $S$-matrix elements. This isomorphism relates the gauge-invariant representation of the Hamiltonian and the required set of gauge-invariant states to a Hamiltonian of the same functional form but dependent on ordinary unconstrained Weyl-gauge fields operating within a space of ``standard'' perturbative states. The fact that the gauge-invariant chromoelectric field is not hermitian has important implications for the functional form of the Hamiltonian finally obtained. When this nonhermiticity is taken into account, the ``extra'' vertices in Christ and Lee's Coulomb-gauge Hamiltonian are natural outgrowths of the formalism. When this nonhermiticity is neglected, the Hamiltonian used in the earlier work of Gribov and others results. |
1503.08805 | Hong-Hao Zhang | Chengfeng Cai, Hong-Hao Zhang | Majorana neutrinos with point interactions | 33 pages, 4 figures, 4 tables | Phys. Rev. D 93, 036003 (2016) | 10.1103/PhysRevD.93.036003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a realistic model with Majorana neutrinos in the framework of
unifying the three generations of fermions by point interactions in an extra
dimension. This model can simultaneously explain the origin of fermion
generations, fermion masses and mixing, and the smallness of the masses of
Majorana neutrinos. We show that there are two mechanisms working together to
suppress the neutrino masses significantly, so we do not have to introduce a
very large extra-dimension cut-off scale. One is the type-I seesaw mechanism
and the other is the overlap integration of localized lepton wave functions. A
singlet scalar with an exponential-like VEV plays a central role in these two
mechanisms. For consistency in this model we introduce a $U(1)'$ gauge
symmetry, which will be broken by the singlet scalar. Parameters of our model
can fit the masses and flavor mixing data well. These parameters can also
predict all CP violating phases including the Majorana ones and accidentally
rescue the proton from decay.
| [
{
"created": "Mon, 30 Mar 2015 19:24:34 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Oct 2015 16:50:56 GMT",
"version": "v2"
}
] | 2016-02-15 | [
[
"Cai",
"Chengfeng",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] | We propose a realistic model with Majorana neutrinos in the framework of unifying the three generations of fermions by point interactions in an extra dimension. This model can simultaneously explain the origin of fermion generations, fermion masses and mixing, and the smallness of the masses of Majorana neutrinos. We show that there are two mechanisms working together to suppress the neutrino masses significantly, so we do not have to introduce a very large extra-dimension cut-off scale. One is the type-I seesaw mechanism and the other is the overlap integration of localized lepton wave functions. A singlet scalar with an exponential-like VEV plays a central role in these two mechanisms. For consistency in this model we introduce a $U(1)'$ gauge symmetry, which will be broken by the singlet scalar. Parameters of our model can fit the masses and flavor mixing data well. These parameters can also predict all CP violating phases including the Majorana ones and accidentally rescue the proton from decay. |
0811.3862 | Sergey Troshin | S.M. Troshin, N.E. Tyurin | Mechanism of single-spin asymmetries generation in the inclusive hadron
processes | 20 pages, 7 figures | Phys.Part.Nucl.41:54-63,2010 | 10.1134/S106377961001003X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a nonperturbative mechanism for generation of the single-spin
asymmetries in hadron interactions. It is based on the chiral quark model
combined with unitarity and impact parameter picture and provides explanation
for the experimental regularities observed under the measurements of the spin
asymmetries.
| [
{
"created": "Mon, 24 Nov 2008 12:58:39 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | We discuss a nonperturbative mechanism for generation of the single-spin asymmetries in hadron interactions. It is based on the chiral quark model combined with unitarity and impact parameter picture and provides explanation for the experimental regularities observed under the measurements of the spin asymmetries. |
1306.5574 | David London | Bhubanjyoti Bhattacharya, David London and Maxime Imbeault | Measurement of gamma using B -> K pi pi and B -> K K Kbar decays | Presented by David London at the 2013 Flavor Physics and CP Violation
conference (FPCP-2013), Buzios, Rio de Janeiro, Brazil, May 19-24, 2013, 9
pages, 4 figures | null | null | UdeM-GPP-TH-13-225 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BaBar measurements of the Dalitz plots for B0 -> K+ pi0 pi-, B0 -> K0 pi+
pi-, B+ -> K+ pi+ pi-, B0 -> K+ K0 K-, and B0 -> K0 K0 Kbar0 decays are used to
cleanly extract the weak phase gamma. We find four possible solutions:
$(31^{+2}_{-3})^\circ$, $(77 \pm 3)^\circ$, $(258^{+4}_{-3})^\circ$, and
$(315^{+3}_{-2})^\circ$. One solution -- $(77 \pm 3)^\circ$ -- is consistent
with the SM. Its error, which includes leading-order flavor-SU(3) breaking, is
far smaller than that obtained using two-body B decays.
| [
{
"created": "Mon, 24 Jun 2013 11:04:10 GMT",
"version": "v1"
}
] | 2013-06-25 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"London",
"David",
""
],
[
"Imbeault",
"Maxime",
""
]
] | The BaBar measurements of the Dalitz plots for B0 -> K+ pi0 pi-, B0 -> K0 pi+ pi-, B+ -> K+ pi+ pi-, B0 -> K+ K0 K-, and B0 -> K0 K0 Kbar0 decays are used to cleanly extract the weak phase gamma. We find four possible solutions: $(31^{+2}_{-3})^\circ$, $(77 \pm 3)^\circ$, $(258^{+4}_{-3})^\circ$, and $(315^{+3}_{-2})^\circ$. One solution -- $(77 \pm 3)^\circ$ -- is consistent with the SM. Its error, which includes leading-order flavor-SU(3) breaking, is far smaller than that obtained using two-body B decays. |
1912.01381 | M\'at\'e Csan\'ad | D. Kincses, M. I. Nagy and M. Csan\'ad | Coulomb and strong interactions in the final state of HBT correlations
for L\'evy type source functions | This research was supported by the NKFIH grants K-128713, FK-123842
and FK-123959 | Phys. Rev. C 102, 064912 (2020) | 10.1103/PhysRevC.102.064912 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present detailed calculations about the expected shape of two-pion
Bose-Einstein (or HBT) correlations in high energy heavy ion collisions that
include a realistic treatment of final state Coulomb interaction as well as
strong interactions (dominated by s-wave scattering). We assume L\'evy type
source functions, a generalization that goes beyond the Gaussian approximation.
Various recent experimental results found the use of such source types
necessary to properly describe the shape of the measured correlation functions.
We find that strong final state interactions may play an important role in the
shape of the two-pion correlation functions, especially if one considers source
parameters beyond the Gaussian HBT radii. Precise experimental determination of
these source parameters (such as L\'evy stability exponent, correlation
strength, etc.) seems to require the inclusion of the treatment of strong
interaction not just for heavier particles (e.g. protons, lambdas) but also in
case of two-pion measurements.
| [
{
"created": "Tue, 3 Dec 2019 14:12:56 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 2020 11:49:45 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Sep 2023 09:47:39 GMT",
"version": "v3"
}
] | 2023-09-27 | [
[
"Kincses",
"D.",
""
],
[
"Nagy",
"M. I.",
""
],
[
"Csanád",
"M.",
""
]
] | We present detailed calculations about the expected shape of two-pion Bose-Einstein (or HBT) correlations in high energy heavy ion collisions that include a realistic treatment of final state Coulomb interaction as well as strong interactions (dominated by s-wave scattering). We assume L\'evy type source functions, a generalization that goes beyond the Gaussian approximation. Various recent experimental results found the use of such source types necessary to properly describe the shape of the measured correlation functions. We find that strong final state interactions may play an important role in the shape of the two-pion correlation functions, especially if one considers source parameters beyond the Gaussian HBT radii. Precise experimental determination of these source parameters (such as L\'evy stability exponent, correlation strength, etc.) seems to require the inclusion of the treatment of strong interaction not just for heavier particles (e.g. protons, lambdas) but also in case of two-pion measurements. |
hep-ph/9605272 | Dimitris Kominis | Dimitris Kominis | Topcolor: A Dynamical Approach to Top Quark Mass Generation | 9 pages, LaTeX, 2 figures, uses epsf.sty. Invited talk presented at
the XXXI Rencontres de Moriond on QCD and High Energy Hadronic Interactions,
Les Arcs, France, March 1996 | null | null | TUM-HEP-248/96 | hep-ph | null | In Topcolor theories the mass of the top quark is generated dynamically by
new strong interactions coupling to the third generation fermions. This leads
to potentially observable effects in flavor-changing neutral current processes
involving heavy flavored mesons, as well as in the production of heavy quarks
at high-energy colliders. Recent theoretical developments and potential
phenomenological constraints on these models are also briefly reviewed.
| [
{
"created": "Fri, 10 May 1996 13:01:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kominis",
"Dimitris",
""
]
] | In Topcolor theories the mass of the top quark is generated dynamically by new strong interactions coupling to the third generation fermions. This leads to potentially observable effects in flavor-changing neutral current processes involving heavy flavored mesons, as well as in the production of heavy quarks at high-energy colliders. Recent theoretical developments and potential phenomenological constraints on these models are also briefly reviewed. |
hep-ph/0301258 | Grzegorz Wilk | F.S.Navarra, O.V.Utyuzh, G.Wilk and Z.Wlodarczyk | Estimating the inelasticity with the information theory approach | 14 pages, 8 figures. Misprints corrected | Phys.Rev. D67 (2003) 114002 | 10.1103/PhysRevD.67.114002 | null | hep-ph nucl-th | null | Using the information theory approach, in both its extensive and nonextensive
versions, we estimate the inelasticity parameter $K$ of hadronic reactions
together with its distribution and energy dependence from $p\bar{p}$ and $pp$
data. We find that the inelasticity remains essentially constant in energy
except for a variation around $K\sim 0.5$, as was originally expected.
| [
{
"created": "Wed, 29 Jan 2003 15:58:30 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2003 14:10:01 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Navarra",
"F. S.",
""
],
[
"Utyuzh",
"O. V.",
""
],
[
"Wilk",
"G.",
""
],
[
"Wlodarczyk",
"Z.",
""
]
] | Using the information theory approach, in both its extensive and nonextensive versions, we estimate the inelasticity parameter $K$ of hadronic reactions together with its distribution and energy dependence from $p\bar{p}$ and $pp$ data. We find that the inelasticity remains essentially constant in energy except for a variation around $K\sim 0.5$, as was originally expected. |
0810.2297 | Mattias Blennow | Mattias Blennow, Alessandro Mirizzi, Pasquale D. Serpico | Nonstandard neutrino-neutrino refractive effects in dense neutrino gases | 9 pages, 4 figures, REVTeX4, minor changes, final version published
in Phys. Rev. D | Phys.Rev.D78:113004,2008 | 10.1103/PhysRevD.78.113004 | MPP-2008-134, CERN-PH-TH/2008-223, FERMILAB-PUB-08-532-A | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effects of nonstandard four-fermion neutrino-neutrino
interactions on the flavor evolution of dense neutrino gases. We find that in
the regions where the neutrino-neutrino refractive index leads to collective
flavor oscillations, the presence of new neutrino interactions can produce
flavor equilibration in both normal and inverted neutrino mass hierarchy. In
realistic supernova environments, these effects are significant if the
nonstandard neutrino-neutrino interaction strength is comparable to the one
expected in the standard case, dominating the ordinary matter potential.
However, very small nonstandard neutrino-neutrino couplings are enough to
trigger the usual collective neutrino flavor transformations in the inverted
neutrino mass hierarchy, even if the mixing angle vanishes exactly.
| [
{
"created": "Mon, 13 Oct 2008 20:00:09 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2008 12:47:26 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Blennow",
"Mattias",
""
],
[
"Mirizzi",
"Alessandro",
""
],
[
"Serpico",
"Pasquale D.",
""
]
] | We investigate the effects of nonstandard four-fermion neutrino-neutrino interactions on the flavor evolution of dense neutrino gases. We find that in the regions where the neutrino-neutrino refractive index leads to collective flavor oscillations, the presence of new neutrino interactions can produce flavor equilibration in both normal and inverted neutrino mass hierarchy. In realistic supernova environments, these effects are significant if the nonstandard neutrino-neutrino interaction strength is comparable to the one expected in the standard case, dominating the ordinary matter potential. However, very small nonstandard neutrino-neutrino couplings are enough to trigger the usual collective neutrino flavor transformations in the inverted neutrino mass hierarchy, even if the mixing angle vanishes exactly. |
2206.09810 | Fernando Arias-Arag\'on | Fernando Arias-Arag\'on, Christopher Smith | Leptoquarks, axions and the unification of B, L, and Peccei-Quinn
symmetries | 40 pages, 9 figures, 1 table. References added, minor changes and new
tittle matching the version accepted for publication at Physical Review D | null | 10.1103/PhysRevD.106.055034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, axion models supplemented by leptoquarks and diquarks are
systematically analyzed. Turning on some couplings to and among these latter
states permits to unify the Peccei-Quinn symmetry with baryon (B) and lepton
(L) numbers, such that the axion becomes associated to the spontaneous breaking
of the three $U(1)$ symmetries. All possible four- and six-fermion patterns of
B and L violation are discussed, including those inducing proton decay, with
$\Delta B = 1$ and $\Delta L = \pm 1, \pm 3$, neutron-antineutron oscillations
with $\Delta B = 2$, and Majorana neutrino masses with $\Delta L = 2$.
Scenarios in which one or two axion fields necessarily appear in any B and/or L
violating operators are also constructed. Nucleon decays would then necessarily
involve an axion in the final state, while neutron-antineutron oscillations
would only happen in an axionic background. This could have implications for
the neutron lifetime puzzle, and more generally, opens the door to new
phenomenological and cosmological applications.
| [
{
"created": "Mon, 20 Jun 2022 14:40:57 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2022 12:19:42 GMT",
"version": "v2"
}
] | 2022-10-12 | [
[
"Arias-Aragón",
"Fernando",
""
],
[
"Smith",
"Christopher",
""
]
] | In this paper, axion models supplemented by leptoquarks and diquarks are systematically analyzed. Turning on some couplings to and among these latter states permits to unify the Peccei-Quinn symmetry with baryon (B) and lepton (L) numbers, such that the axion becomes associated to the spontaneous breaking of the three $U(1)$ symmetries. All possible four- and six-fermion patterns of B and L violation are discussed, including those inducing proton decay, with $\Delta B = 1$ and $\Delta L = \pm 1, \pm 3$, neutron-antineutron oscillations with $\Delta B = 2$, and Majorana neutrino masses with $\Delta L = 2$. Scenarios in which one or two axion fields necessarily appear in any B and/or L violating operators are also constructed. Nucleon decays would then necessarily involve an axion in the final state, while neutron-antineutron oscillations would only happen in an axionic background. This could have implications for the neutron lifetime puzzle, and more generally, opens the door to new phenomenological and cosmological applications. |
1808.00795 | Pablo Guerrero-Rodr\'iguez | Javier L. Albacete, Pablo Guerrero-Rodr\'iguez, Cyrille Marquet | Initial correlations of the Glasma energy-momentum tensor | Final published version | J. High Energ. Phys. (2019) 2019: 73 | 10.1007/JHEP01(2019)073 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytical calculation of the covariance of the energy-momentum
tensor associated to the gluon field produced in ultra-relativistic heavy ion
collisions at early times, the Glasma. This object involves the two-point and
single-point correlators of the energy-momentum tensor ($\langle
T^{\mu\nu}(x_{\perp})T^{\sigma\rho}(y_{\perp})\rangle$ and $\langle
T^{\mu\nu}(x_{\perp})\rangle$, respectively) at proper time $\tau\!=\!0^+$. Our
approach is based on the Color Glass Condensate effective theory, which allows
us to map the fluctuations of the valence color sources in the colliding nuclei
to those of the energy-momentum tensor of the produced gluon fields via the
solution of the classical equations of motion in the presence of external
currents. The color sources in the two colliding nuclei are characterized by
Gaussian correlations, albeit in more generality than in the
McLerran-Venugopalan model, allowing for non-trivial impact parameter and
transverse dependence of the two-point correlator. We compare our results to
those obtained under the Glasma Graph approximation, finding agreement in the
limit of short transverse separations. However, important differences arise at
larger transverse separations, where our result displays a slower fall-off than
the Glasma Graph result ($r^{-2}$ vs $r^{-4}$ power-law decay), indicating that
the color screening of the correlations in the transverse plane occurs at
distances larger than $1/Q_s$ by a logarithmic factor sensitive to the
infrared. In the Glasma flux tube picture, this implies that the color domains
are larger than originally estimated.
| [
{
"created": "Thu, 2 Aug 2018 13:14:22 GMT",
"version": "v1"
},
{
"created": "Sat, 11 May 2019 01:06:02 GMT",
"version": "v2"
}
] | 2019-05-14 | [
[
"Albacete",
"Javier L.",
""
],
[
"Guerrero-Rodríguez",
"Pablo",
""
],
[
"Marquet",
"Cyrille",
""
]
] | We present an analytical calculation of the covariance of the energy-momentum tensor associated to the gluon field produced in ultra-relativistic heavy ion collisions at early times, the Glasma. This object involves the two-point and single-point correlators of the energy-momentum tensor ($\langle T^{\mu\nu}(x_{\perp})T^{\sigma\rho}(y_{\perp})\rangle$ and $\langle T^{\mu\nu}(x_{\perp})\rangle$, respectively) at proper time $\tau\!=\!0^+$. Our approach is based on the Color Glass Condensate effective theory, which allows us to map the fluctuations of the valence color sources in the colliding nuclei to those of the energy-momentum tensor of the produced gluon fields via the solution of the classical equations of motion in the presence of external currents. The color sources in the two colliding nuclei are characterized by Gaussian correlations, albeit in more generality than in the McLerran-Venugopalan model, allowing for non-trivial impact parameter and transverse dependence of the two-point correlator. We compare our results to those obtained under the Glasma Graph approximation, finding agreement in the limit of short transverse separations. However, important differences arise at larger transverse separations, where our result displays a slower fall-off than the Glasma Graph result ($r^{-2}$ vs $r^{-4}$ power-law decay), indicating that the color screening of the correlations in the transverse plane occurs at distances larger than $1/Q_s$ by a logarithmic factor sensitive to the infrared. In the Glasma flux tube picture, this implies that the color domains are larger than originally estimated. |
hep-ph/0606198 | Juan Antonio Aguilar-Saavedra | F. del Aguila, J. A. Aguilar-Saavedra, R. Pittau | Neutrino physics at large colliders | LaTeX 32 pages. This review summarises and extends work presented at
several conferences. To appear in the proceedings of CORFU2005. References
added | J.Phys.Conf.Ser.53:506-527,2006 | 10.1088/1742-6596/53/1/032 | null | hep-ph | null | Large colliders are not sensitive to light neutrino masses and character, but
they can produce new heavy neutrinos, allowing also for the determination of
their Dirac or Majorana nature. We review the discovery limits at the next
generation of large colliders.
| [
{
"created": "Mon, 19 Jun 2006 19:16:18 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2006 10:19:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"del Aguila",
"F.",
""
],
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Pittau",
"R.",
""
]
] | Large colliders are not sensitive to light neutrino masses and character, but they can produce new heavy neutrinos, allowing also for the determination of their Dirac or Majorana nature. We review the discovery limits at the next generation of large colliders. |
hep-ph/0606262 | Alexander V. Kuznetsov | A.V. Kuznetsov and N.V. Mikheev (Yaroslavl State (P.G. Demidov)
University, Russia) | Plasma induced neutrino radiative decay instead of neutrino spin light | 7 pages, LaTeX, 1 EPS figure, submitted to Modern Physics Letters A | Mod.Phys.Lett. A21 (2006) 1769-1776 | 10.1142/S0217732306021104 | YARU-HE-06/03 | hep-ph | null | The conversion nu_L -> nu_R gamma^* of a neutrino with a magnetic moment is
considered, caused by the additional Wolfenstein energy acquired by a
left-handed neutrino in medium, with an accurate taking account of the photon
\gamma^* dispersion in medium. It is shown that the threshold arises in the
process, caused by the photon (plasmon) effective mass. This threshold leaves
no room for the so-called "neutrino spin light" in the most of astrophysical
situations.
| [
{
"created": "Sun, 25 Jun 2006 07:14:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kuznetsov",
"A. V.",
"",
"Yaroslavl State"
],
[
"Mikheev",
"N. V.",
"",
"Yaroslavl State"
]
] | The conversion nu_L -> nu_R gamma^* of a neutrino with a magnetic moment is considered, caused by the additional Wolfenstein energy acquired by a left-handed neutrino in medium, with an accurate taking account of the photon \gamma^* dispersion in medium. It is shown that the threshold arises in the process, caused by the photon (plasmon) effective mass. This threshold leaves no room for the so-called "neutrino spin light" in the most of astrophysical situations. |
0712.2763 | Pelaez | A. Gomez Nicola, J.R. Pelaez, G. Rios (U. Complutense de Madrid) | The Inverse Amplitude Method and Adler Zeros | 17 pages, 4 figures | Phys.Rev.D77:056006,2008 | 10.1103/PhysRevD.77.056006 | null | hep-ph | null | The Inverse Amplitude Method is a powerful unitarization technique to enlarge
the energy applicability region of Effective Lagrangians. It has been widely
used to describe resonances from Chiral Perturbation Theory as well as for the
Strongly Interacting Symmetry Breaking Sector. In this work we show how it can
be slightly modified to account also for the sub-threshold region,
incorporating correctly the Adler zeros required by chiral symmetry and
eliminating spurious poles. These improvements produce negligible effects on
the physical region.
| [
{
"created": "Mon, 17 Dec 2007 16:30:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nicola",
"A. Gomez",
"",
"U. Complutense de Madrid"
],
[
"Pelaez",
"J. R.",
"",
"U. Complutense de Madrid"
],
[
"Rios",
"G.",
"",
"U. Complutense de Madrid"
]
] | The Inverse Amplitude Method is a powerful unitarization technique to enlarge the energy applicability region of Effective Lagrangians. It has been widely used to describe resonances from Chiral Perturbation Theory as well as for the Strongly Interacting Symmetry Breaking Sector. In this work we show how it can be slightly modified to account also for the sub-threshold region, incorporating correctly the Adler zeros required by chiral symmetry and eliminating spurious poles. These improvements produce negligible effects on the physical region. |
0807.0132 | Ming Zhong | Feng Wu, Ming Zhong | TeV Scale Lee-Wick Fields out of Large Extra Dimensional Gravity | 17 pages, 3 figures, references added, to appear in Phys. Rev. D | Phys.Rev.D78:085010,2008 | 10.1103/PhysRevD.78.085010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational corrections to the Maxwell, Dirac and Klein-Gorden
theories in the large extra dimension model in which the gravitons propagate in
the (4+n)-dimensional bulk, while the gauge and matter fields are confined to
the four-dimensional world. The corrections to the two-point Green's functions
of the gauge and matter fields from the exchanges of virtual Kaluza-Klein
gravitons are calculated in the gauge independent background field method. In
the framework of effective field theory, we show that the modified one-loop
renormalizable Lagrangian due to quantum gravitational effects contains a TeV
scale Lee-Wick partner of every gauge and matter field as extra degrees of
freedom in the theory. Thus the large extra dimension model of gravity provides
a natural mechanism to the emergence of these exotic particles which were
recently used to construct an extension of the Standard Model.
| [
{
"created": "Tue, 1 Jul 2008 12:18:20 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2008 10:31:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wu",
"Feng",
""
],
[
"Zhong",
"Ming",
""
]
] | We study the gravitational corrections to the Maxwell, Dirac and Klein-Gorden theories in the large extra dimension model in which the gravitons propagate in the (4+n)-dimensional bulk, while the gauge and matter fields are confined to the four-dimensional world. The corrections to the two-point Green's functions of the gauge and matter fields from the exchanges of virtual Kaluza-Klein gravitons are calculated in the gauge independent background field method. In the framework of effective field theory, we show that the modified one-loop renormalizable Lagrangian due to quantum gravitational effects contains a TeV scale Lee-Wick partner of every gauge and matter field as extra degrees of freedom in the theory. Thus the large extra dimension model of gravity provides a natural mechanism to the emergence of these exotic particles which were recently used to construct an extension of the Standard Model. |
1904.04787 | Yongchao Zhang | P. S. Bhupal Dev, Rabindra N. Mohapatra, Yongchao Zhang | CP Violating Effects in Heavy Neutrino Oscillations: Implications for
Colliders and Leptogenesis | 35 pages, 11 figures and 1 table, updated with more details | null | 10.1007/JHEP11(2019)137 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two of the important implications of the seesaw mechanism are: (i) a simple
way to understand the small neutrino masses, and (ii) the origin of
matter-anti-matter asymmetry in the universe via the leptogenesis mechanism.
For TeV-scale seesaw models, successful leptogenesis requires that the
right-handed neutrinos (RHNs) must be quasi-degenerate and if they have CP
violating phases, they also contribute to the CP asymmetry. We investigate this
in the TeV-scale left-right models for seesaw and point out a way to probe the
quasi-degeneracy possibility with CP violating mixings for RHNs in hadron
colliders using simple observables constructed out of same-sign dilepton charge
asymmetry (SSCA). In particular, we isolate the parameter regions of the model,
where the viability of leptogenesis can be tested using the SSCA at the Large
Hadron Collider, as well as future 27 TeV and 100 TeV hadron colliders. We also
independently confirm an earlier result that there is a generic lower bound on
the $W_R$ mass of about 10 TeV for leptogenesis to work.
| [
{
"created": "Tue, 9 Apr 2019 17:06:58 GMT",
"version": "v1"
},
{
"created": "Sun, 5 May 2019 07:46:59 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Sep 2019 16:03:09 GMT",
"version": "v3"
}
] | 2020-01-29 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Zhang",
"Yongchao",
""
]
] | Two of the important implications of the seesaw mechanism are: (i) a simple way to understand the small neutrino masses, and (ii) the origin of matter-anti-matter asymmetry in the universe via the leptogenesis mechanism. For TeV-scale seesaw models, successful leptogenesis requires that the right-handed neutrinos (RHNs) must be quasi-degenerate and if they have CP violating phases, they also contribute to the CP asymmetry. We investigate this in the TeV-scale left-right models for seesaw and point out a way to probe the quasi-degeneracy possibility with CP violating mixings for RHNs in hadron colliders using simple observables constructed out of same-sign dilepton charge asymmetry (SSCA). In particular, we isolate the parameter regions of the model, where the viability of leptogenesis can be tested using the SSCA at the Large Hadron Collider, as well as future 27 TeV and 100 TeV hadron colliders. We also independently confirm an earlier result that there is a generic lower bound on the $W_R$ mass of about 10 TeV for leptogenesis to work. |
0707.2955 | Ernesto Arganda | E. Arganda, M.J. Herrero and A.M. Teixeira | $\mu-e$ conversion in nuclei within the CMSSM seesaw: universality
versus non-universality | 48 pages, 15 figures. Minor typos corrected and some references added | JHEP0710:104,2007 | 10.1088/1126-6708/2007/10/104 | FTUAM-07/10, IFT-UAM/CSIC-07-28, LPT-ORSAY-07-51 | hep-ph | null | In this paper we study $\mu-e$ conversion in nuclei within the context of the
Constrained Minimal Supersymmetric Standard Model, enlarged by three right
handed neutrinos and their supersymmetric partners, and where the neutrino
masses are generated via a seesaw mechanism. Two different scenarios with
either universal or non-universal soft supersymmetry breaking Higgs masses at
the gauge coupling unification scale are considered. In the first part we
present a complete one-loop computation of the conversion rate for this process
that includes the photon-, $Z$-boson, and Higgs-boson penguins, as well as box
diagrams, and compare their size in the two considered scenarios. Then, in
these two scenarios we analyse the relevance of the various parameters on the
conversion rates, particularly emphasising the role played by the heavy
neutrino masses, $\tan \beta$, and especially $\theta_{13}$. In the case of
hierachical heavy neutrinos, an extremely high sensitivity of the rates to
$\theta_{13}$ is indeed found. The last part of this work is devoted to the
study of the interesting loss of correlation between the $\mu-e$ conversion and
$\mu \to e \gamma$ rates that occurs in the non-universal scenario. In the case
of large $\tan \beta$ and light $H^0$ Higgs boson an enhanced ratio of the
$\mu-e$ to $\mu \to e \gamma$ rates, with respect to the universal case is
found, and this could be tested with the future experimental sensitivities.
| [
{
"created": "Thu, 19 Jul 2007 19:22:48 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2007 16:30:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arganda",
"E.",
""
],
[
"Herrero",
"M. J.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | In this paper we study $\mu-e$ conversion in nuclei within the context of the Constrained Minimal Supersymmetric Standard Model, enlarged by three right handed neutrinos and their supersymmetric partners, and where the neutrino masses are generated via a seesaw mechanism. Two different scenarios with either universal or non-universal soft supersymmetry breaking Higgs masses at the gauge coupling unification scale are considered. In the first part we present a complete one-loop computation of the conversion rate for this process that includes the photon-, $Z$-boson, and Higgs-boson penguins, as well as box diagrams, and compare their size in the two considered scenarios. Then, in these two scenarios we analyse the relevance of the various parameters on the conversion rates, particularly emphasising the role played by the heavy neutrino masses, $\tan \beta$, and especially $\theta_{13}$. In the case of hierachical heavy neutrinos, an extremely high sensitivity of the rates to $\theta_{13}$ is indeed found. The last part of this work is devoted to the study of the interesting loss of correlation between the $\mu-e$ conversion and $\mu \to e \gamma$ rates that occurs in the non-universal scenario. In the case of large $\tan \beta$ and light $H^0$ Higgs boson an enhanced ratio of the $\mu-e$ to $\mu \to e \gamma$ rates, with respect to the universal case is found, and this could be tested with the future experimental sensitivities. |
hep-ph/0502017 | Hirobumi Mineo | H. Mineo, Shin Nan Yang, Chi-Yee Cheung, and W. Bentz | The generalized parton distributions of the nucleon in the NJL model
based on the Faddeev approach | 35 pages, 15 figures | null | 10.1016/j.nuclphysbps.2004.12.042 | null | hep-ph | null | We study the generalized parton distributions, including the helicity-flip
ones, using Nambu-Jona-Lasinio model based on a relativistic Faddeev approach
with `static approximation'. Sum rules relating the generalized parton
distributions to nucleon electromagnetic form factors are satisfied. Moreover,
quark-antiquark contributions in the region $-\xi<x<\xi$ are non-vanishing. Our
results are qualitatively similar to those calculated with Radyushkin's double
distribution ansatz using forward parton distribution functions calculated in
the NJL model as inputs.
| [
{
"created": "Wed, 2 Feb 2005 08:05:35 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Mineo",
"H.",
""
],
[
"Yang",
"Shin Nan",
""
],
[
"Cheung",
"Chi-Yee",
""
],
[
"Bentz",
"W.",
""
]
] | We study the generalized parton distributions, including the helicity-flip ones, using Nambu-Jona-Lasinio model based on a relativistic Faddeev approach with `static approximation'. Sum rules relating the generalized parton distributions to nucleon electromagnetic form factors are satisfied. Moreover, quark-antiquark contributions in the region $-\xi<x<\xi$ are non-vanishing. Our results are qualitatively similar to those calculated with Radyushkin's double distribution ansatz using forward parton distribution functions calculated in the NJL model as inputs. |
hep-ph/9408373 | null | D. Atwood, B. Blok and A. Soni | Feasibility of Extracting V_td from Radiative B(B_s) Decays | 19 pages. [Figures can be obtained by sending e-mail message to
soni@bnlcl1.bnl.gov] | Int.J.Mod.Phys.A11:3743-3760,1996; Nuovo Cim.A109:873-883,1996 | 10.1142/S0217751X96001759 | SLAC-PUB-6635 | hep-ph | null | We use existing measurements of $D^-\to K^{\ast0}\rho^-$ and $B\to
\psi+K^\ast$, coupled with flavor independence of QCD, and with vector meson
dominance to show that long distance contributions to $B\to \rho +\gamma$ are
potentially very serious. We note that long distance (LD) contributions can be
appreciably different in $B^-\to \rho^-+\gamma$ and $B^0\to \rho^0 (\omega)
+\gamma$. All radiative decays of $B$, $B_S$ are shown to be governed
essentially by two LD and two short-distance (SD) hadronic entities. Separate
measurements of $B^-\to \rho^-+\gamma$, $B^0\to \rho^0 (\omega) +\gamma$, along
with $B\to K^\ast +\gamma$ appear necessary for a meaningful extraction of
\vtd. Measurements of $B_S\to \phi+\gamma$ and $K^{\ast0}+\gamma$ could also
provide very useful consistency checks.
| [
{
"created": "Thu, 25 Aug 1994 21:23:08 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Atwood",
"D.",
""
],
[
"Blok",
"B.",
""
],
[
"Soni",
"A.",
""
]
] | We use existing measurements of $D^-\to K^{\ast0}\rho^-$ and $B\to \psi+K^\ast$, coupled with flavor independence of QCD, and with vector meson dominance to show that long distance contributions to $B\to \rho +\gamma$ are potentially very serious. We note that long distance (LD) contributions can be appreciably different in $B^-\to \rho^-+\gamma$ and $B^0\to \rho^0 (\omega) +\gamma$. All radiative decays of $B$, $B_S$ are shown to be governed essentially by two LD and two short-distance (SD) hadronic entities. Separate measurements of $B^-\to \rho^-+\gamma$, $B^0\to \rho^0 (\omega) +\gamma$, along with $B\to K^\ast +\gamma$ appear necessary for a meaningful extraction of \vtd. Measurements of $B_S\to \phi+\gamma$ and $K^{\ast0}+\gamma$ could also provide very useful consistency checks. |
1408.3429 | Martin Bauer | Wolfgang Altmannshofer, William A. Bardeen, Martin Bauer, Marcela
Carena, Joseph D. Lykken | Light Dark Matter, Naturalness, and the Radiative Origin of the
Electroweak Scale | 36 pages, 6 figures | null | 10.1007/JHEP01(2015)032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study classically scale invariant models in which the Standard Model Higgs
mass term is replaced in the Lagrangian by a Higgs portal coupling to a complex
scalar field of a dark sector. We focus on models that are weakly coupled with
the quartic scalar couplings nearly vanishing at the Planck scale. The dark
sector contains fermions and scalars charged under dark SU(2) x U(1) gauge
interactions. Radiative breaking of the dark gauge group triggers electroweak
symmetry breaking through the Higgs portal coupling. Requiring both a Higgs
boson mass of 125.5 GeV and stability of the Higgs potential up to the Planck
scale implies that the radiative breaking of the dark gauge group occurs at the
TeV scale. We present a particular model which features a long-range abelian
dark force. The dominant dark matter component is neutral dark fermions, with
the correct thermal relic abundance, and in reach of future direct detection
experiments. The model also has lighter stable dark fermions charged under the
dark force, with observable effects on galactic-scale structure. Collider
signatures include a dark sector scalar boson with mass < 250 GeV that decays
through mixing with the Higgs boson, and can be detected at the LHC. The Higgs
boson, as well as the new scalar, may have significant invisible decays into
dark sector particles.
| [
{
"created": "Thu, 14 Aug 2014 21:02:49 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Bardeen",
"William A.",
""
],
[
"Bauer",
"Martin",
""
],
[
"Carena",
"Marcela",
""
],
[
"Lykken",
"Joseph D.",
""
]
] | We study classically scale invariant models in which the Standard Model Higgs mass term is replaced in the Lagrangian by a Higgs portal coupling to a complex scalar field of a dark sector. We focus on models that are weakly coupled with the quartic scalar couplings nearly vanishing at the Planck scale. The dark sector contains fermions and scalars charged under dark SU(2) x U(1) gauge interactions. Radiative breaking of the dark gauge group triggers electroweak symmetry breaking through the Higgs portal coupling. Requiring both a Higgs boson mass of 125.5 GeV and stability of the Higgs potential up to the Planck scale implies that the radiative breaking of the dark gauge group occurs at the TeV scale. We present a particular model which features a long-range abelian dark force. The dominant dark matter component is neutral dark fermions, with the correct thermal relic abundance, and in reach of future direct detection experiments. The model also has lighter stable dark fermions charged under the dark force, with observable effects on galactic-scale structure. Collider signatures include a dark sector scalar boson with mass < 250 GeV that decays through mixing with the Higgs boson, and can be detected at the LHC. The Higgs boson, as well as the new scalar, may have significant invisible decays into dark sector particles. |
hep-ph/9906480 | Boris Pioline | I. Antoniadis and B. Pioline (Ecole Polytechnique) | Large Dimensions and String Physics at a TeV | 17 pages, talk presented by the first author at the conferences
``Fundamental interactions: from symmetries to black holes'' in honor of
Francois Englert, Brussels, March 25-27, 1999 and ``Beyond the Desert 99'',
Castle Ringberg, Tegernsee, Germany, June 6-12, 1999 | null | null | CPHT-PC720.0699 | hep-ph hep-th | null | Large extra dimensions, of size of order of TeV^{-1} ~= 10^{-16} cm, arise
naturally in the context of supersymmetry breaking in string theory, while
strings at a TeV scale offer a solution to the gauge hierarchy problem, as an
alternative to softly broken supersymmetry or technicolor. In this short
review, we present consistent perturbative realizations of string theories with
large volume compactifications and low string tensions, and discuss their main
physical implications.
| [
{
"created": "Thu, 24 Jun 1999 13:17:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Antoniadis",
"I.",
"",
"Ecole Polytechnique"
],
[
"Pioline",
"B.",
"",
"Ecole Polytechnique"
]
] | Large extra dimensions, of size of order of TeV^{-1} ~= 10^{-16} cm, arise naturally in the context of supersymmetry breaking in string theory, while strings at a TeV scale offer a solution to the gauge hierarchy problem, as an alternative to softly broken supersymmetry or technicolor. In this short review, we present consistent perturbative realizations of string theories with large volume compactifications and low string tensions, and discuss their main physical implications. |
1006.2095 | Erhan Iltan | E. O. Iltan | Lepton flavor violating Higgs decays induced by massive unparticle | 11 pages, 7 figures, 1 table | Acta Phys.Polon.B41:2423,2010 | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We predict the branching ratios of the lepton flavor violating Higgs decays
H^0\rightarrow e^{\pm} \mu^{\pm}, H^0\rightarrow e^{\pm} \tau^{\pm} and
H^0\rightarrow \mu^{\pm} \tau^{\pm} with the assumption that lepton flavor
violation is due to the unparticle mediation. Here, we consider an effective
interaction which breaks the conformal invariance after the electroweak
symmetry breaking and causes that unparticle becomes massive. The new
interaction results in a modification of the mediating unparticle propagator
and brings additional contribution to the branching ratios of the lepton flavor
violating decays with the new vertex including Higgs field and two unparticle
fields. We observe that the branching ratios of the decays under consideration
lie in the range of 10^{-6}-10^{-4}.
| [
{
"created": "Thu, 10 Jun 2010 17:49:18 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2010 13:52:54 GMT",
"version": "v2"
}
] | 2010-11-02 | [
[
"Iltan",
"E. O.",
""
]
] | We predict the branching ratios of the lepton flavor violating Higgs decays H^0\rightarrow e^{\pm} \mu^{\pm}, H^0\rightarrow e^{\pm} \tau^{\pm} and H^0\rightarrow \mu^{\pm} \tau^{\pm} with the assumption that lepton flavor violation is due to the unparticle mediation. Here, we consider an effective interaction which breaks the conformal invariance after the electroweak symmetry breaking and causes that unparticle becomes massive. The new interaction results in a modification of the mediating unparticle propagator and brings additional contribution to the branching ratios of the lepton flavor violating decays with the new vertex including Higgs field and two unparticle fields. We observe that the branching ratios of the decays under consideration lie in the range of 10^{-6}-10^{-4}. |
2308.12122 | Fabio L. Braghin | Fabio L. Braghin, Marcelo Loewe, Cristian Villavicencio | The Yukawa potential under weak magnetic field | 16 pages, 12 figures, revised manuscript, accepted for publication | Phys. Rev. D 109, 034014 (2024) | 10.1103/PhysRevD.109.034014 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Weak magnetic field induced corrections for the Yukawa potential due to one
pion exchange between two constituent quarks (nucleons) are presented. For
that, the constant magnetic field effect on the pion propagator and on the pion
form factor are taken into account. An effective gluon propagator parameterized
with an effective gluon mass ($M_g\sim 0.5$\,GeV) is considered. In the limit
of magnetic field weak with respect to the constituent quark mass and pion
mass, analytical and semi-analytical expressions can be obtained. Different
types of contributions are found, isotropic or anisotropic, dependent on the
pion mass and also on the constituent quark and effective gluon masses. Overall
the corrections are of the order of $2\%$ to $5\%$ of the Yukawa potential at
distances close to $2$fm, and they decrease slower than the Yukawa potential.
The anistropic corrections are considerably smaller than the isotropic
components. A sizable splitting between results due to magnetic field dependent
neutral or charged pion mass is found.
| [
{
"created": "Wed, 23 Aug 2023 13:17:49 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jan 2024 12:27:04 GMT",
"version": "v2"
}
] | 2024-08-16 | [
[
"Braghin",
"Fabio L.",
""
],
[
"Loewe",
"Marcelo",
""
],
[
"Villavicencio",
"Cristian",
""
]
] | Weak magnetic field induced corrections for the Yukawa potential due to one pion exchange between two constituent quarks (nucleons) are presented. For that, the constant magnetic field effect on the pion propagator and on the pion form factor are taken into account. An effective gluon propagator parameterized with an effective gluon mass ($M_g\sim 0.5$\,GeV) is considered. In the limit of magnetic field weak with respect to the constituent quark mass and pion mass, analytical and semi-analytical expressions can be obtained. Different types of contributions are found, isotropic or anisotropic, dependent on the pion mass and also on the constituent quark and effective gluon masses. Overall the corrections are of the order of $2\%$ to $5\%$ of the Yukawa potential at distances close to $2$fm, and they decrease slower than the Yukawa potential. The anistropic corrections are considerably smaller than the isotropic components. A sizable splitting between results due to magnetic field dependent neutral or charged pion mass is found. |
hep-ph/0411119 | Yeinzon Rodriguez Garcia | Konstantinos Dimopoulos (1), David H. Lyth (1), Yeinzon Rodriguez (1
and 2) ((1) Department of Physics Lancaster University, (2) Centro de
Investigaciones Universidad Antonio Narino) | Low scale inflation and the curvaton mechanism | Latex file in Revtex style. 17 pages, 3 figures. v2: added material
and corrected mistakes to take into account the constraints on the behaviour
of the radial field coming from the requirements of the spectral index of
density perturbations. v3: typos corrected. Reference added. Version accepted
for publication in Journal of High Energy Physics | JHEP0502:055,2005 | 10.1088/1126-6708/2005/02/055 | null | hep-ph astro-ph | null | The primordial curvature perturbation may be due to a `curvaton' field, which
dominates (or almost dominates) the energy density before it decays. In the
simplest version of the curvaton model the scale of inflation has to be quite
high corresponding to a Hubble parameter H>10^7 GeV. We here explore two
modifications of the curvaton model which can instead allow inflation at a low
scale. (i) The curvaton is a Pseudo Nambu-Goldstone Boson (PNGB), with a
symmetry-breaking phase transition during inflation. (ii) The curvaton mass
increases suddenly at some moment after the end of inflation but before the
onset of the curvaton oscillations. Both proposals can work but not in a
completely natural way. Also, the lower bound on the scale of inflation depends
somewhat on the details of the framework used. Nevertheless, we show that
inflation with H as low as 1 TeV or lower is possible to be attained.
| [
{
"created": "Mon, 8 Nov 2004 18:40:30 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2005 20:43:29 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Mar 2005 21:00:43 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Dimopoulos",
"Konstantinos",
"",
"1\n and 2"
],
[
"Lyth",
"David H.",
"",
"1\n and 2"
],
[
"Rodriguez",
"Yeinzon",
"",
"1\n and 2"
]
] | The primordial curvature perturbation may be due to a `curvaton' field, which dominates (or almost dominates) the energy density before it decays. In the simplest version of the curvaton model the scale of inflation has to be quite high corresponding to a Hubble parameter H>10^7 GeV. We here explore two modifications of the curvaton model which can instead allow inflation at a low scale. (i) The curvaton is a Pseudo Nambu-Goldstone Boson (PNGB), with a symmetry-breaking phase transition during inflation. (ii) The curvaton mass increases suddenly at some moment after the end of inflation but before the onset of the curvaton oscillations. Both proposals can work but not in a completely natural way. Also, the lower bound on the scale of inflation depends somewhat on the details of the framework used. Nevertheless, we show that inflation with H as low as 1 TeV or lower is possible to be attained. |
1510.01701 | David Marsh | Jihn E. Kim and David J. E. Marsh | An ultralight pseudoscalar boson | 14 pages, 3 figures. v2 numerical error on N corrected, conclusions
unchanged. Typos and notation corrected. Matches version published in PRD | Phys. Rev. D 93, 025027 (2016) | 10.1103/PhysRevD.93.025027 | KCL-PH-TH/2015-44 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a fundamental discrete symmetry, $\mathbb{Z}_N$, we construct a
two-axion model with the QCD axion solving the strong-$CP$ problem, and an
ultralight axion (ULA) with $m_{\rm ULA}\approx 10^{-22}\text{ eV}$ providing
the dominant form of dark matter (DM). The ULA is light enough to be detectable
in cosmology from its imprints on structure formation, and may resolve the
small-scale problems of cold DM. The necessary relative DM abundances occur
without fine tuning in constructions with decay constants $f_{\rm ULA}\sim
10^{17}\text{ GeV}$, and $f_{\rm QCD}\sim 10^{11}\text{ GeV}$. An example model
achieving this has $N=24$, and we construct a range of other possibilities. We
compute the ULA couplings to the Standard Model, and discuss prospects for
direct detection. The QCD axion may be detectable in standard experiments
through the $\vec{E}\cdot\vec{B}$ and $G\tilde{G}$ couplings. In the simplest
models, however, the ULA has identically zero coupling to both $G\tilde{G}$ of
QCD and $\vec{E}\cdot\vec{B}$ of electromagnetism due to vanishing
electromagnetic and color anomalies. The ULA couples to fermions with strength
$g\propto 1/f_{\rm ULA}$. This coupling causes spin precession of nucleons and
electrons with respect to the DM wind with period $t\sim$months. Current limits
do not exclude the predicted coupling strength, and our model is within reach
of the CASPEr-Wind experiment, using nuclear magnetic resonance.
| [
{
"created": "Tue, 6 Oct 2015 19:05:50 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 2016 11:25:21 GMT",
"version": "v2"
}
] | 2016-02-03 | [
[
"Kim",
"Jihn E.",
""
],
[
"Marsh",
"David J. E.",
""
]
] | Using a fundamental discrete symmetry, $\mathbb{Z}_N$, we construct a two-axion model with the QCD axion solving the strong-$CP$ problem, and an ultralight axion (ULA) with $m_{\rm ULA}\approx 10^{-22}\text{ eV}$ providing the dominant form of dark matter (DM). The ULA is light enough to be detectable in cosmology from its imprints on structure formation, and may resolve the small-scale problems of cold DM. The necessary relative DM abundances occur without fine tuning in constructions with decay constants $f_{\rm ULA}\sim 10^{17}\text{ GeV}$, and $f_{\rm QCD}\sim 10^{11}\text{ GeV}$. An example model achieving this has $N=24$, and we construct a range of other possibilities. We compute the ULA couplings to the Standard Model, and discuss prospects for direct detection. The QCD axion may be detectable in standard experiments through the $\vec{E}\cdot\vec{B}$ and $G\tilde{G}$ couplings. In the simplest models, however, the ULA has identically zero coupling to both $G\tilde{G}$ of QCD and $\vec{E}\cdot\vec{B}$ of electromagnetism due to vanishing electromagnetic and color anomalies. The ULA couples to fermions with strength $g\propto 1/f_{\rm ULA}$. This coupling causes spin precession of nucleons and electrons with respect to the DM wind with period $t\sim$months. Current limits do not exclude the predicted coupling strength, and our model is within reach of the CASPEr-Wind experiment, using nuclear magnetic resonance. |
2211.03233 | Nuno Filipe Castro | Miguel Ca\c{c}ador Peixoto, Nuno Filipe Castro, Miguel Crispim
Rom\~ao, Maria Gabriela Jord\~ao Oliveira, In\^es Ochoa | Fitting a Collider in a Quantum Computer: Tackling the Challenges of
Quantum Machine Learning for Big Datasets | Code available in https://github.com/mcpeixoto/QML-HEP | Front. Artif. Intell. 6 (2023) 1268852 | 10.3389/frai.2023.1268852 | null | hep-ph hep-ex physics.data-an quant-ph | http://creativecommons.org/licenses/by/4.0/ | Current quantum systems have significant limitations affecting the processing
of large datasets with high dimensionality, typical of high energy physics. In
the present paper, feature and data prototype selection techniques were studied
to tackle this challenge. A grid search was performed and quantum machine
learning models were trained and benchmarked against classical shallow machine
learning methods, trained both in the reduced and the complete datasets. The
performance of the quantum algorithms was found to be comparable to the
classical ones, even when using large datasets. Sequential Backward Selection
and Principal Component Analysis techniques were used for feature's selection
and while the former can produce the better quantum machine learning models in
specific cases, it is more unstable. Additionally, we show that such
variability in the results is caused by the use of discrete variables,
highlighting the suitability of Principal Component analysis transformed data
for quantum machine learning applications in the high energy physics context.
| [
{
"created": "Sun, 6 Nov 2022 22:45:37 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Dec 2022 14:17:29 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Mar 2023 15:12:35 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Dec 2023 19:47:05 GMT",
"version": "v4"
}
] | 2023-12-18 | [
[
"Peixoto",
"Miguel Caçador",
""
],
[
"Castro",
"Nuno Filipe",
""
],
[
"Romão",
"Miguel Crispim",
""
],
[
"Oliveira",
"Maria Gabriela Jordão",
""
],
[
"Ochoa",
"Inês",
""
]
] | Current quantum systems have significant limitations affecting the processing of large datasets with high dimensionality, typical of high energy physics. In the present paper, feature and data prototype selection techniques were studied to tackle this challenge. A grid search was performed and quantum machine learning models were trained and benchmarked against classical shallow machine learning methods, trained both in the reduced and the complete datasets. The performance of the quantum algorithms was found to be comparable to the classical ones, even when using large datasets. Sequential Backward Selection and Principal Component Analysis techniques were used for feature's selection and while the former can produce the better quantum machine learning models in specific cases, it is more unstable. Additionally, we show that such variability in the results is caused by the use of discrete variables, highlighting the suitability of Principal Component analysis transformed data for quantum machine learning applications in the high energy physics context. |
hep-ph/9504333 | null | S. Narison (Laboratoire de Physique Math\'ematique Universit\'e de
Montpellier) | Model-independent determination of $\overline{m}_s$ from $\tau$-like
inclusive decays in $e^+e^-$ and implications for the $\chi SB$-parameters | Latex file | Phys.Lett.B358:113-122,1995 | 10.1016/0370-2693(95)00939-I | null | hep-ph | null | We determine the strange quark running mass of the $\overline{MS}$-scheme by
$simulating$ $\tau$-$like$ inclusive processes for the $old$ Das-Mathur-Okubo
sum rule relating the $e^+e^-$ into $I=0$ and $I=1$ hadrons total
cross-sections data. We obtain to three-loop accuracy: $\overline{m}_s$(1
GeV)=($196.7\pm 29.1$) MeV. By combining this result with the pseudoscalar sum
rule estimate of $(\overline{m}_d +\overline{m}_u)$ and the standard current
algebra values of the light quark mass ratios, we deduce the $average$:
$\overline{m}_d$(1 GeV)=$(10.3\pm 1.5)$ MeV, $\overline{m}_u$(1 GeV)=$(5.0\pm
1.5)$ MeV and $\frac{1}{2}\la \bar uu +\bar dd \ra$ (1 GeV) $ \simeq
-[(228.6\pm 9.1) \mbox{MeV}]^3$. Using also our value of $m_s$, we update the
estimates of the $K'(1.46)$ and $K^*_0(1.43)$ decay constants and of the
(pseudo)scalar two-point correlator subtraction constants. Then, we deduce a
deviation of about 34\% from kaon PCAC and the ratio of the {\it
normal-ordered} condensates: $\la \bar ss \ra /\la \bar uu \ra =
0.68^{+0.15}_{-0.29}$, which confirm previous findings from QCD spectral sum
rules. Finally, using the recent value of the $\overline{m}_b$ from the
$\Upsilon$-sum rules, we deduce the scale independent quark-mass ratio:
$m_b/m_s=34\pm 4$.
| [
{
"created": "Wed, 19 Apr 1995 14:35:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Narison",
"S.",
"",
"Laboratoire de Physique Mathématique Université de\n Montpellier"
]
] | We determine the strange quark running mass of the $\overline{MS}$-scheme by $simulating$ $\tau$-$like$ inclusive processes for the $old$ Das-Mathur-Okubo sum rule relating the $e^+e^-$ into $I=0$ and $I=1$ hadrons total cross-sections data. We obtain to three-loop accuracy: $\overline{m}_s$(1 GeV)=($196.7\pm 29.1$) MeV. By combining this result with the pseudoscalar sum rule estimate of $(\overline{m}_d +\overline{m}_u)$ and the standard current algebra values of the light quark mass ratios, we deduce the $average$: $\overline{m}_d$(1 GeV)=$(10.3\pm 1.5)$ MeV, $\overline{m}_u$(1 GeV)=$(5.0\pm 1.5)$ MeV and $\frac{1}{2}\la \bar uu +\bar dd \ra$ (1 GeV) $ \simeq -[(228.6\pm 9.1) \mbox{MeV}]^3$. Using also our value of $m_s$, we update the estimates of the $K'(1.46)$ and $K^*_0(1.43)$ decay constants and of the (pseudo)scalar two-point correlator subtraction constants. Then, we deduce a deviation of about 34\% from kaon PCAC and the ratio of the {\it normal-ordered} condensates: $\la \bar ss \ra /\la \bar uu \ra = 0.68^{+0.15}_{-0.29}$, which confirm previous findings from QCD spectral sum rules. Finally, using the recent value of the $\overline{m}_b$ from the $\Upsilon$-sum rules, we deduce the scale independent quark-mass ratio: $m_b/m_s=34\pm 4$. |
hep-ph/0703108 | Alexander Westphal | Alexander Westphal, Hartmut Abele, Stefan Baessler | Analytically derived limits on short-range fifth forces from quantum
states of neutrons in the Earth's gravitational field | 9 pages, 2 figures, LaTeX, uses RevTeX 4 | null | null | DESY 05-066 | hep-ph | null | Recently, quantum states of ultra-cold neutrons in the Earth's gravitational
field have been observed for the first time. From the fact that they are
consistent with Newtonian gravity on the 10 %-level, analytical limits on alpha
and lambda of short-range Yukawa-like additional interactions are derived
between lambda = 1 micrometer and 1 mm. We arrive for lambda > 10 micrometer at
alpha < 2 \cdot 10^11 at 90 % confidence level. This translates into a limit
g_s g_p / (\hbar c) < 2 \cdot 10^{-15} on the pseudo-scalar coupling of axions
in the previously experimentally unaccessible astrophysical axion window.
| [
{
"created": "Fri, 9 Mar 2007 22:27:35 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2007 20:40:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Westphal",
"Alexander",
""
],
[
"Abele",
"Hartmut",
""
],
[
"Baessler",
"Stefan",
""
]
] | Recently, quantum states of ultra-cold neutrons in the Earth's gravitational field have been observed for the first time. From the fact that they are consistent with Newtonian gravity on the 10 %-level, analytical limits on alpha and lambda of short-range Yukawa-like additional interactions are derived between lambda = 1 micrometer and 1 mm. We arrive for lambda > 10 micrometer at alpha < 2 \cdot 10^11 at 90 % confidence level. This translates into a limit g_s g_p / (\hbar c) < 2 \cdot 10^{-15} on the pseudo-scalar coupling of axions in the previously experimentally unaccessible astrophysical axion window. |
hep-ph/9211248 | null | R. Casalbuoni, A. Deandrea, N. Di Bartolomeo F. Feruglio, R. Gatto and
G. Nardulli | Effective Lagrangian for Heavy and Light Mesons: Semileptonic Decays | LaTeX (style article), 19 pages, UGVA-DPT 1992/11-790, BARI-TH/92-125 | Phys.Lett. B299 (1993) 139-150 | 10.1016/0370-2693(93)90895-O | null | hep-ph | null | We introduce an effective lagrangian including negative and positive parity
heavy mesons containing a heavy quark, light pseudoscalars, and light vector
resonances, with their allowed interactions, using heavy quark spin-flavour
symmetry, chiral symmetry, and the hidden symmetry approach for light vector
resonances. On the basis of such a lagrangian, by considering the allowed weak
currents and by including the contributions from the nearest unitarity poles we
calculate the form factors for semileptonic decays of $B$ and $D$ mesons into
light pseudoscalars and light vector resonances. The available data, together
with some additional assumptions, allow for a set of predictions in the
different semileptonic channels, which can be compared with those following
{}from different approaches. A discussion of non-dominant terms in our
approach, which attempts at including a rather complete dynamics, will however
have to wait till more abundant data become available.
| [
{
"created": "Mon, 16 Nov 1992 11:41:14 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 1992 12:40:41 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Casalbuoni",
"R.",
""
],
[
"Deandrea",
"A.",
""
],
[
"Feruglio",
"N. Di Bartolomeo F.",
""
],
[
"Gatto",
"R.",
""
],
[
"Nardulli",
"G.",
""
]
] | We introduce an effective lagrangian including negative and positive parity heavy mesons containing a heavy quark, light pseudoscalars, and light vector resonances, with their allowed interactions, using heavy quark spin-flavour symmetry, chiral symmetry, and the hidden symmetry approach for light vector resonances. On the basis of such a lagrangian, by considering the allowed weak currents and by including the contributions from the nearest unitarity poles we calculate the form factors for semileptonic decays of $B$ and $D$ mesons into light pseudoscalars and light vector resonances. The available data, together with some additional assumptions, allow for a set of predictions in the different semileptonic channels, which can be compared with those following {}from different approaches. A discussion of non-dominant terms in our approach, which attempts at including a rather complete dynamics, will however have to wait till more abundant data become available. |
hep-ph/0210367 | Yu-Feng Zhou | Yue-Liang Wu and Yu-Feng Zhou | Isospin relation and SU(3) breaking effects of strong phases in
Charmless B decays | 14 pages, revtex4, no figure, references added. Updated to the latest
data. To appear in Euro. Phys. Journ. C | Eur.Phys.J.Direct C5:014,2003; Eur.Phys.J.C32S1:179-190,2004 | 10.1140/epjcd/s2003-01-0014-4 | null | hep-ph | null | Isospin and flavor SU(3) relations in charmless hadronic B decays $B\to \pi
\pi, \pi K$ are investigated in detail with paying attention to the SU(3)
symmetry breaking effects in both amplitudes and strong phases. In general, the
isospin and the flavor SU(3) structure of the effective Hamiltonian provide
several relations among the amplitudes and strong phases. Whereas a global fit
to the latest data shows that some relation seems not to be favorable for a
consistent explanation to the current data within the standard model (SM). By
considering several patterns of SU(3) breaking, the amplitudes and the
corresponding strong phases are extracted and compared with the theoretical
estimations. It is found that in the case of SU(3) limits and also the case
with SU(3) breaking only in amplitudes, the fitting results lead to an
unexpected large ratio between two isospin amplitudes
$a^{c}_{3/2}/a^{u}_{3/2}$, which is about an order of magnitude larger than the
SM prediction. The results are found to be insensitive to the weak phase
$\gamma$. By including SU(3) breaking effects on the strong phases, one is able
to obtain a consistent fit to the current data within the SM, which implies
that the SU(3) breaking effect on strong phases may play an important role in
understanding the observed charmless hadronic B decay modes $B\to \pi \pi$ and
$\pi K$. It is possible to test those breaking effects in the near future from
more precise measurements of direct CP violation in B factories.
| [
{
"created": "Sun, 27 Oct 2002 16:41:20 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2002 14:11:11 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Aug 2003 12:33:24 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Isospin and flavor SU(3) relations in charmless hadronic B decays $B\to \pi \pi, \pi K$ are investigated in detail with paying attention to the SU(3) symmetry breaking effects in both amplitudes and strong phases. In general, the isospin and the flavor SU(3) structure of the effective Hamiltonian provide several relations among the amplitudes and strong phases. Whereas a global fit to the latest data shows that some relation seems not to be favorable for a consistent explanation to the current data within the standard model (SM). By considering several patterns of SU(3) breaking, the amplitudes and the corresponding strong phases are extracted and compared with the theoretical estimations. It is found that in the case of SU(3) limits and also the case with SU(3) breaking only in amplitudes, the fitting results lead to an unexpected large ratio between two isospin amplitudes $a^{c}_{3/2}/a^{u}_{3/2}$, which is about an order of magnitude larger than the SM prediction. The results are found to be insensitive to the weak phase $\gamma$. By including SU(3) breaking effects on the strong phases, one is able to obtain a consistent fit to the current data within the SM, which implies that the SU(3) breaking effect on strong phases may play an important role in understanding the observed charmless hadronic B decay modes $B\to \pi \pi$ and $\pi K$. It is possible to test those breaking effects in the near future from more precise measurements of direct CP violation in B factories. |
hep-ph/9407395 | null | A.D. Dolgov, K. Kainulainen and I.Z. Rothstein | Bounds on Dirac Neutrino Masses from Nucleosynthesis | 10 pages, UM-TH-94-21, UMN-TH-1303-94, FERMILAB-Pub-94/199-A | Phys.Rev.D51:4129-4133,1995 | 10.1103/PhysRevD.51.4129 | null | hep-ph | null | We derive new bounds on the Dirac mass of the tau and muonic neutrinos. By
solving the kinetic equation for the rate of energy deposition due to helicity
flipping processes and imposing the constraint that the number of effective
species contributing to the energy density at the time of nucleosynthesis be
$\Delta k_\nu<~0.3$, we find the bounds $m_{\nu_\mu} < ~150$ KeV and
$m_{\nu_\tau} < ~190$ KeV for $T_{\rm QCD}= 200$ MeV. The constraint $\Delta
k_\nu~<0.1~$ leads to the much stronger bound $m_\nu <10$ KeV for both species
of neutrinos.
| [
{
"created": "Thu, 28 Jul 1994 22:23:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dolgov",
"A. D.",
""
],
[
"Kainulainen",
"K.",
""
],
[
"Rothstein",
"I. Z.",
""
]
] | We derive new bounds on the Dirac mass of the tau and muonic neutrinos. By solving the kinetic equation for the rate of energy deposition due to helicity flipping processes and imposing the constraint that the number of effective species contributing to the energy density at the time of nucleosynthesis be $\Delta k_\nu<~0.3$, we find the bounds $m_{\nu_\mu} < ~150$ KeV and $m_{\nu_\tau} < ~190$ KeV for $T_{\rm QCD}= 200$ MeV. The constraint $\Delta k_\nu~<0.1~$ leads to the much stronger bound $m_\nu <10$ KeV for both species of neutrinos. |
2004.05165 | Ekaterina Shlepkina | Konstantin M. Belotsky, Airat Kh. Kamaletdinov, Ekaterina S.
Shlepkina, Maxim L. Solovyov | Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter | The article was published in MDPI "Particle". The authors used to the
article structure suggested by the journal (MDPI "Particles") | Particles 2020, 3, 336-344 | 10.3390/particles3020025 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed anomalous excess of high-energy cosmic ray (CR) positrons is
widely discussed as possible indirect evidence for dark matter (DM). However,
any source of cosmic positrons is inevitably the source of gamma radiation. The
least model dependent test of CR anomalies interpretation via DM particles
decays (or annihilation) is connected with gamma-ray background due to gamma
overproduction in such processes. In this work, we impose an observational
constraint on gamma ray production from DM. Then, we study the possible
suppression of gamma yield in the DM decays into identical final fermions. Such
DM particles arise in the multi-component dark atom model. The influence of the
interaction vertices on the gamma suppression was also considered. No essential
gamma suppression effects are found. However, some minor ones are revealed.
| [
{
"created": "Fri, 10 Apr 2020 16:10:20 GMT",
"version": "v1"
}
] | 2020-04-14 | [
[
"Belotsky",
"Konstantin M.",
""
],
[
"Kamaletdinov",
"Airat Kh.",
""
],
[
"Shlepkina",
"Ekaterina S.",
""
],
[
"Solovyov",
"Maxim L.",
""
]
] | The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed. |
hep-ph/0108072 | Tatsuo Kobayashi | Tatsuo Kobayashi, Haruhiko Terao | More about Kaluza-Klein Regularization | 9 pages, latex, 2 figures | Prog.Theor.Phys. 107 (2002) 785-792 | 10.1143/PTP.107.785 | null | hep-ph hep-th | null | We study the so-called ``Kaluza-Klein regularization''. We calculate one-loop
corrections to the Higgs mass due to Kaluza-Klein modes explicitly in a model
with SUSY breaking mass splitting between bosonic and fermionic modes. We
perform the proper time cutoff at $1/\Lambda^2$ and the KK level truncation at
$\ell$. It is shown that the finite result is obtained as long as $\ell \gg
R\Lambda$ for the compactification radius $R$.
| [
{
"created": "Wed, 8 Aug 2001 06:48:06 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Aug 2001 06:02:08 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Terao",
"Haruhiko",
""
]
] | We study the so-called ``Kaluza-Klein regularization''. We calculate one-loop corrections to the Higgs mass due to Kaluza-Klein modes explicitly in a model with SUSY breaking mass splitting between bosonic and fermionic modes. We perform the proper time cutoff at $1/\Lambda^2$ and the KK level truncation at $\ell$. It is shown that the finite result is obtained as long as $\ell \gg R\Lambda$ for the compactification radius $R$. |
1906.01063 | Saurabh Bansal | Saurabh Bansal, Antonio Delgado, Christopher Kolda and Mariano Quiros | Constraining R-parity-violating couplings in $\tau$-processes at the LHC
and in electroweak precision measurements | 9 pages, 3 figures, 3 tables | Phys. Rev. D 100, 093005 (2019) | 10.1103/PhysRevD.100.093005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find new limits on the $\lambda'_{3jk}$ R-parity violating (RPV) couplings
of the minimal supersymmetric standard model, using Drell-Yan differential
cross sections at the LHC and electroweak precision measurements from LEP and
SLC. Specifically, limits on six out of the nine $\lambda'_{3jk}$-couplings,
with $j=1\text{ or }2$, are obtained using Drell-Yan data, with the remaining
three (for $j=3$) bounded by precision electroweak data. We also update the
limits on all $\lambda'_{ijk}$-couplings using electroweak data and find new
bounds on $\lambda'_{132}$ and $\lambda'_{232}$ that are stronger than obtained
elsewhere. A table of all current bounds on $\lambda'_{ijk}$ is given in an
appendix.
| [
{
"created": "Mon, 3 Jun 2019 20:20:34 GMT",
"version": "v1"
}
] | 2019-11-27 | [
[
"Bansal",
"Saurabh",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Kolda",
"Christopher",
""
],
[
"Quiros",
"Mariano",
""
]
] | We find new limits on the $\lambda'_{3jk}$ R-parity violating (RPV) couplings of the minimal supersymmetric standard model, using Drell-Yan differential cross sections at the LHC and electroweak precision measurements from LEP and SLC. Specifically, limits on six out of the nine $\lambda'_{3jk}$-couplings, with $j=1\text{ or }2$, are obtained using Drell-Yan data, with the remaining three (for $j=3$) bounded by precision electroweak data. We also update the limits on all $\lambda'_{ijk}$-couplings using electroweak data and find new bounds on $\lambda'_{132}$ and $\lambda'_{232}$ that are stronger than obtained elsewhere. A table of all current bounds on $\lambda'_{ijk}$ is given in an appendix. |
hep-ph/0609313 | Fulvio Piccinini | G. Balossini, C.M. Carloni Calame, G. Montagna, O. Nicrosini, F.
Piccinini | Matching Parton Shower and matrix elements in QED | 4 pages. Talk given at the XXXIII International Conference on High
Energy Physics, ICHEP06, Moscow, 26 July - 02 August, 2006 | Nucl.Phys. B758 (2006) 227-253 | null | null | hep-ph | null | We report on a high-precision calculation of the Bhabha process in QED, of
interest for precise luminosity determination of low-energy electron-positron
colliders. The calculation is based on the matching of exact next-to-leading
order corrections with a Parton Shower algorithm. The structure of the
algorithm (implemented in an improved version of the event generator BABAYAGA)
is illustrated, with a discussion on the resulting theoretical uncertainty, of
the order of 0.1 %.
| [
{
"created": "Fri, 29 Sep 2006 16:30:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Balossini",
"G.",
""
],
[
"Calame",
"C. M. Carloni",
""
],
[
"Montagna",
"G.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Piccinini",
"F.",
""
]
] | We report on a high-precision calculation of the Bhabha process in QED, of interest for precise luminosity determination of low-energy electron-positron colliders. The calculation is based on the matching of exact next-to-leading order corrections with a Parton Shower algorithm. The structure of the algorithm (implemented in an improved version of the event generator BABAYAGA) is illustrated, with a discussion on the resulting theoretical uncertainty, of the order of 0.1 %. |
1901.06315 | Pere Arnan | Pere Arnan, Damir Becirevic, Federico Mescia and Olcyr Sumensari | Probing low energy scalar leptoquarks by the leptonic $W$ and $Z$
couplings | Minor typos amended | null | 10.1007/JHEP02(2019)109 | LPT-Orsay-19-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the generic one-loop contribution involving scalar leptoquarks
(LQ) to the $W$ and $Z$ leptonic decay widths. In our computation we include
for the first time the finite terms and the corrections due to the external
momenta of the electroweak bosons, which is a step beyond the
leading-logarithmic approximation considered in the literature so far. We show
that the terms we include can be numerically quite significant. They amount to
about $20\%$ for scalar LQ masses below $1.5$~TeV, as currently allowed by the
direct searches at the LHC. To further illustrate the relevance of our results
we revisit a model with two light scalar LQs, proposed to accommodate the
$B$-physics anomalies. We show that the finite terms we computed can reduce the
tension with the $Z$-pole data.
| [
{
"created": "Fri, 18 Jan 2019 16:01:25 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 12:56:24 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Feb 2019 10:58:21 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Jul 2019 15:06:57 GMT",
"version": "v4"
}
] | 2019-07-16 | [
[
"Arnan",
"Pere",
""
],
[
"Becirevic",
"Damir",
""
],
[
"Mescia",
"Federico",
""
],
[
"Sumensari",
"Olcyr",
""
]
] | We compute the generic one-loop contribution involving scalar leptoquarks (LQ) to the $W$ and $Z$ leptonic decay widths. In our computation we include for the first time the finite terms and the corrections due to the external momenta of the electroweak bosons, which is a step beyond the leading-logarithmic approximation considered in the literature so far. We show that the terms we include can be numerically quite significant. They amount to about $20\%$ for scalar LQ masses below $1.5$~TeV, as currently allowed by the direct searches at the LHC. To further illustrate the relevance of our results we revisit a model with two light scalar LQs, proposed to accommodate the $B$-physics anomalies. We show that the finite terms we computed can reduce the tension with the $Z$-pole data. |
2408.00503 | Yao Ma | Yao Ma, Wei-Lin Wu, Lu Meng, Yan-Ke Chen, Shi-Lin Zhu | Fully strange tetraquark resonant states as the cousins of $X(6900)$ | 9 pages, 2 figures. Comments are welcomed | null | null | null | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conduct systematic calculations of the S-wave fully strange systems with
``normal" $\left(J^{P C}=0^{++}, 1^{+-}, 2^{++}\right)$ and ``exotic"
$\left(J^{P C}=0^{+-}, 1^{++}, 2^{+-}\right)$ C-parities, which are the strange
analogue of the fully charmed tetraquark state $X(6900)$. Within a constituent
quark potential model, we employ the Gaussian expansion method to solve the
four-body Schr\"odinger equation and the complex scaling method to identify
resonant states. We obtain a series of resonant states and zero-width states in
the mass range of 2.7 to 3.3 GeV, with their widths ranging from less than 1
MeV to about 50 MeV. Their rms radii strongly indicate that they are compact
tetraquark states. Among these states, the $T_{4s,2^{++}}(2714)$ may be the
most likely one to be observed experimentally. We urge the experimental
exploration of the $2^{++}$ $s s \bar{s} \bar{s}$ state around 2.7 GeV in the
$\phi\phi$ channel. Since the lowest S-wave $s s \bar{s} \bar{s}$ state is
around 2.7 GeV, the compact P-wave $s s \bar{s} \bar{s}$ states are expected to
be heavier. Hence, $\phi(2170)$ and $X(2370)$ are unlikely to be compact
tetraquark states.
| [
{
"created": "Thu, 1 Aug 2024 12:15:31 GMT",
"version": "v1"
}
] | 2024-08-02 | [
[
"Ma",
"Yao",
""
],
[
"Wu",
"Wei-Lin",
""
],
[
"Meng",
"Lu",
""
],
[
"Chen",
"Yan-Ke",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We conduct systematic calculations of the S-wave fully strange systems with ``normal" $\left(J^{P C}=0^{++}, 1^{+-}, 2^{++}\right)$ and ``exotic" $\left(J^{P C}=0^{+-}, 1^{++}, 2^{+-}\right)$ C-parities, which are the strange analogue of the fully charmed tetraquark state $X(6900)$. Within a constituent quark potential model, we employ the Gaussian expansion method to solve the four-body Schr\"odinger equation and the complex scaling method to identify resonant states. We obtain a series of resonant states and zero-width states in the mass range of 2.7 to 3.3 GeV, with their widths ranging from less than 1 MeV to about 50 MeV. Their rms radii strongly indicate that they are compact tetraquark states. Among these states, the $T_{4s,2^{++}}(2714)$ may be the most likely one to be observed experimentally. We urge the experimental exploration of the $2^{++}$ $s s \bar{s} \bar{s}$ state around 2.7 GeV in the $\phi\phi$ channel. Since the lowest S-wave $s s \bar{s} \bar{s}$ state is around 2.7 GeV, the compact P-wave $s s \bar{s} \bar{s}$ states are expected to be heavier. Hence, $\phi(2170)$ and $X(2370)$ are unlikely to be compact tetraquark states. |
2212.07756 | Xu-Xiang Li | Qing-Hong Cao, Katsuya Hashino, Xu-Xiang Li and Jiang-Hao Yu | Multi-step phase transition and gravitational wave from general
$\mathbb{Z}_2$ scalar extensions | 40 pages, 12 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Multi-step phase transition provides a paradigm in which a broken symmetry
during phase transition can be restored, enriching the phenomena of both dark
matter and baryon asymmetry. We study the dynamics of the multi-step phase
transition in the standard model extension with additional isospin $N$-plet
scalar field $\Phi_2$ under a discrete $\mathbb{Z}_2$ symmetry. We find that
the multi-step phase transition could be triggered if there is a moderately
large coupling between the Higgs and the $\Phi_2$ and this coupling is required
to be larger as the mass of the $\Phi_2$ and/or isospin increase. The
first-order phase transition at the first (second) step can be realized by the
thermal loop (tree-level barrier) effects. Thus it is more likely that a
detectable spectrum of gravitational waves can be produced at the second step
of the phase transition.
| [
{
"created": "Thu, 15 Dec 2022 12:20:03 GMT",
"version": "v1"
}
] | 2022-12-16 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Hashino",
"Katsuya",
""
],
[
"Li",
"Xu-Xiang",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] | Multi-step phase transition provides a paradigm in which a broken symmetry during phase transition can be restored, enriching the phenomena of both dark matter and baryon asymmetry. We study the dynamics of the multi-step phase transition in the standard model extension with additional isospin $N$-plet scalar field $\Phi_2$ under a discrete $\mathbb{Z}_2$ symmetry. We find that the multi-step phase transition could be triggered if there is a moderately large coupling between the Higgs and the $\Phi_2$ and this coupling is required to be larger as the mass of the $\Phi_2$ and/or isospin increase. The first-order phase transition at the first (second) step can be realized by the thermal loop (tree-level barrier) effects. Thus it is more likely that a detectable spectrum of gravitational waves can be produced at the second step of the phase transition. |
2403.12155 | Shantanu Sahoo | Soumitra Nandi, Shantanu Sahoo and Ria Sain | An Imperative study of the angular observables in $\Lambda_b^0 \to
\Lambda_c^{+}(\to \Lambda \pi^{+})\tau \bar{\nu_{\tau}}$ decay and probing
the footprint of new physics | 42 pages, 56 figures, 15 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the 4-body angular distribution for $\Lambda_b \to \Lambda_c^{+}(\to
\Lambda \pi^{+})\ell^- \bar{\nu}$ decays and find out the analytical
expressions for various asymmetric and angular observables in the Standard
Model and the new physics scenarios and compared them with the literature.
Using the available inputs from the lattice, we have predicted the values with
uncertainties of all these observables in the Standard Model. Considering the
new physics effects in $b\to c\tau^-\bar{\nu}_{\tau}$ transitions, we have
constrained the new Wilson coefficients of the one operator and two operator
scenarios from the available data on these decays. The two-operator scenario
with scalar-pseudoscalar and tensor quark current provides the most plausible
solution to the current data. Also, we have tested the new physics
sensitivities (one or two-operator scenarios) of the different angular
observables in $\Lambda_b \to \Lambda_c (\to \Lambda \pi^{+}) \tau^-
\bar{\nu}_{\tau}$ decays and found correlations among them. We have noted a few
one or two-operator scenarios to which some of these observables are sensitive.
By measuring these observables, it will be possible to distinguish these
effects from one another.
| [
{
"created": "Mon, 18 Mar 2024 18:12:17 GMT",
"version": "v1"
}
] | 2024-03-20 | [
[
"Nandi",
"Soumitra",
""
],
[
"Sahoo",
"Shantanu",
""
],
[
"Sain",
"Ria",
""
]
] | We study the 4-body angular distribution for $\Lambda_b \to \Lambda_c^{+}(\to \Lambda \pi^{+})\ell^- \bar{\nu}$ decays and find out the analytical expressions for various asymmetric and angular observables in the Standard Model and the new physics scenarios and compared them with the literature. Using the available inputs from the lattice, we have predicted the values with uncertainties of all these observables in the Standard Model. Considering the new physics effects in $b\to c\tau^-\bar{\nu}_{\tau}$ transitions, we have constrained the new Wilson coefficients of the one operator and two operator scenarios from the available data on these decays. The two-operator scenario with scalar-pseudoscalar and tensor quark current provides the most plausible solution to the current data. Also, we have tested the new physics sensitivities (one or two-operator scenarios) of the different angular observables in $\Lambda_b \to \Lambda_c (\to \Lambda \pi^{+}) \tau^- \bar{\nu}_{\tau}$ decays and found correlations among them. We have noted a few one or two-operator scenarios to which some of these observables are sensitive. By measuring these observables, it will be possible to distinguish these effects from one another. |
1909.12674 | Jian Tang | Wei-Jie Feng, Jian Tang, Tse-Chun Wang and Yi-Xing Zhou | Non-standard interactions versus planet-scale neutrino oscillations | 8 pages, 7 figures, make a comparison with other LBL experiments and
add more references | Phys. Rev. D 100, 115034 (2019) | 10.1103/PhysRevD.100.115034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-energy threshold and the large detector size of Precision IceCube
Next Generation Upgrade (PINGU) can make the study on neutrino oscillations
with a planet-scale baseline possible. In this task, we consider the
configuration that neutrinos are produced at CERN and detected in the PINGU
detector, as a benchmark. We discuss its sensitivity of measuring the size of
non-standard interactions (NSIs) in matter, which can be described by the
parameter $\epsilon_{\alpha\beta}$ ($\alpha$ and $\beta$ are flavors of
neutrinos). We find that the CERN-PINGU configuration improves
$\tilde{\epsilon}_{\mu\mu}\equiv\epsilon_{\mu\mu}-\epsilon_{\tau\tau}$ and
$\epsilon_{\mu\tau}$ significantly compared to the next-generation accelerator
neutrino experiments. Most of degeneracy problems in the precision measurements
can be resolved, except the one for $\tilde{\epsilon}_{\mu\mu}\sim-0.035$.
Moreover, we point out that this configuration can also be used to detect the
CP violation brought by NSIs. Finally, we compare the physics potential in this
configuration to that for DUNE, T2HK and P2O, and find that the CERN-PINGU
configuration can significantly improve the sensitivity to NSIs.
| [
{
"created": "Fri, 27 Sep 2019 13:28:39 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2019 03:03:54 GMT",
"version": "v2"
}
] | 2019-12-25 | [
[
"Feng",
"Wei-Jie",
""
],
[
"Tang",
"Jian",
""
],
[
"Wang",
"Tse-Chun",
""
],
[
"Zhou",
"Yi-Xing",
""
]
] | The low-energy threshold and the large detector size of Precision IceCube Next Generation Upgrade (PINGU) can make the study on neutrino oscillations with a planet-scale baseline possible. In this task, we consider the configuration that neutrinos are produced at CERN and detected in the PINGU detector, as a benchmark. We discuss its sensitivity of measuring the size of non-standard interactions (NSIs) in matter, which can be described by the parameter $\epsilon_{\alpha\beta}$ ($\alpha$ and $\beta$ are flavors of neutrinos). We find that the CERN-PINGU configuration improves $\tilde{\epsilon}_{\mu\mu}\equiv\epsilon_{\mu\mu}-\epsilon_{\tau\tau}$ and $\epsilon_{\mu\tau}$ significantly compared to the next-generation accelerator neutrino experiments. Most of degeneracy problems in the precision measurements can be resolved, except the one for $\tilde{\epsilon}_{\mu\mu}\sim-0.035$. Moreover, we point out that this configuration can also be used to detect the CP violation brought by NSIs. Finally, we compare the physics potential in this configuration to that for DUNE, T2HK and P2O, and find that the CERN-PINGU configuration can significantly improve the sensitivity to NSIs. |
hep-ph/0010200 | Markus Diehl | Markus Diehl | Exploring skewed parton distribution with polarized target | 8 pages. Contribution to the eRHIC White Paper | null | null | SLAC-PUB-8670 | hep-ph | null | I briefly review the physics of skewed parton distributions. Special emphasis
is put on the relevance of target polarization, and on the different roles of
small and of intermediate x_B.
| [
{
"created": "Wed, 18 Oct 2000 08:58:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diehl",
"Markus",
""
]
] | I briefly review the physics of skewed parton distributions. Special emphasis is put on the relevance of target polarization, and on the different roles of small and of intermediate x_B. |
2202.04221 | Kiyoharu Kawana | Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda, Kei Yagyu | Gravitational waves in models with multicritical-point principle | 22 pages, 6 figures | null | 10.1140/epjc/s10052-022-10440-8 | OU-HET-1130 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The multicritical-point principle (MPP) provides a natural explanation of the
large hierarchy between the Planck and electroweak scales. We consider a
scenario in which MPP is applied to the Standard Model extended by two real
singlet scalar fields $\phi$ and $S$, and a dimensional transmutation occurs by
the vacuum expectation value of $\phi$. In this paper, we focus on the critical
points that possess a $\mathbb Z_2$ symmetry $S\rightarrow -S$ and all the
other fields are left invariant. Then $S$ becomes a natural dark matter (DM)
candidate. Further, we concentrate on the critical points where $\phi$ does not
possess further $\mathbb Z_2$ symmetry so that there is no cosmological
domain-wall problem. Among such critical points, we focus on maximally critical
one called CP-1234 that fix all the superrenormalizable parameters. We show
that there remains a parameter region that satisfies the DM relic abundance, DM
direct-detection bound and the current LHC constraints. In this region, we find
a first-order phase transition in the early universe around the TeV-scale
temperature. The resultant gravitational waves are predicted with a peak
amplitude of ${\cal O}(10^{-12})$ at a frequency of $10^{-2}$-$10^{-1}$ Hz,
which can be tested with future space-based instruments such as DECIGO and BBO.
| [
{
"created": "Wed, 9 Feb 2022 01:42:28 GMT",
"version": "v1"
}
] | 2022-06-08 | [
[
"Hamada",
"Yuta",
""
],
[
"Kawai",
"Hikaru",
""
],
[
"Kawana",
"Kiyoharu",
""
],
[
"Oda",
"Kin-ya",
""
],
[
"Yagyu",
"Kei",
""
]
] | The multicritical-point principle (MPP) provides a natural explanation of the large hierarchy between the Planck and electroweak scales. We consider a scenario in which MPP is applied to the Standard Model extended by two real singlet scalar fields $\phi$ and $S$, and a dimensional transmutation occurs by the vacuum expectation value of $\phi$. In this paper, we focus on the critical points that possess a $\mathbb Z_2$ symmetry $S\rightarrow -S$ and all the other fields are left invariant. Then $S$ becomes a natural dark matter (DM) candidate. Further, we concentrate on the critical points where $\phi$ does not possess further $\mathbb Z_2$ symmetry so that there is no cosmological domain-wall problem. Among such critical points, we focus on maximally critical one called CP-1234 that fix all the superrenormalizable parameters. We show that there remains a parameter region that satisfies the DM relic abundance, DM direct-detection bound and the current LHC constraints. In this region, we find a first-order phase transition in the early universe around the TeV-scale temperature. The resultant gravitational waves are predicted with a peak amplitude of ${\cal O}(10^{-12})$ at a frequency of $10^{-2}$-$10^{-1}$ Hz, which can be tested with future space-based instruments such as DECIGO and BBO. |
hep-ph/0012366 | Martti Raidal | Ernest Ma and Martti Raidal | Three Active and Two Sterile Neutrinos in an E_6 Model of Diquark
Baryogenesis | LATEX, 13 pages | J.Phys.G28:95-102,2002 | 10.1088/0954-3899/28/1/307 | UCRHEP-T296 | hep-ph | null | In the U(1)_N extension of the supersymmetric standard model with E_6
particle content, the heavy singlet superfield N may decay into a quark and a
diquark as well as an antiquark and an antidiquark, thus creating a baryon
asymmetry of the Universe. We show how the three doublet and two singlet
neutrinos in this model acquire mass from physics at the TeV scale without the
benefit of using N as a heavy right-handed neutrino. Specifically, the active
neutrinos get masses via the bilinear term \mu LX^c which conserves R-parity,
and via the nonzero masses of the sterile neutrinos. We predict fixed
properties of the extra Z' boson, as well as the new lepton doublets X and X^c,
and the observation of diquark resonances at hadron colliders in this scenario.
| [
{
"created": "Thu, 28 Dec 2000 21:44:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
""
],
[
"Raidal",
"Martti",
""
]
] | In the U(1)_N extension of the supersymmetric standard model with E_6 particle content, the heavy singlet superfield N may decay into a quark and a diquark as well as an antiquark and an antidiquark, thus creating a baryon asymmetry of the Universe. We show how the three doublet and two singlet neutrinos in this model acquire mass from physics at the TeV scale without the benefit of using N as a heavy right-handed neutrino. Specifically, the active neutrinos get masses via the bilinear term \mu LX^c which conserves R-parity, and via the nonzero masses of the sterile neutrinos. We predict fixed properties of the extra Z' boson, as well as the new lepton doublets X and X^c, and the observation of diquark resonances at hadron colliders in this scenario. |
2306.14578 | Ethan Cline | Andrei Afanasev, Jan C. Bernauer, Peter Blunden, Johannes Bl\"umlein,
Ethan W. Cline, Jan M. Friedrich, Franziska Hagelstein, Tom\'a\v{s} Husek,
Michael Kohl, Fred Myhrer, Gil Paz, Susan Schadmand, Axel Schmidt, Vladyslava
Sharkovska, Adrian Signer, Oleksandr Tomalak, Egle Tomasi-Gustafsson, Yannick
Ulrich, Marc Vanderhaeghen | Radiative Corrections: From Medium to High Energy Experiments | Review article to be submitted to the EPJ A Topical Collection on
radiative corrections. 63 pages, 27 figures, 3 tables | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative corrections are crucial for modern high-precision physics
experiments, and are an area of active research in the experimental and
theoretical community. Here we provide an overview of the state of the field of
radiative corrections with a focus on several topics: lepton-proton scattering,
QED corrections in deep-inelastic scattering, and in radiative light-hadron
decays. Particular emphasis is placed on the two-photon exchange, believed to
be responsible for the proton form-factor discrepancy, and associated
Monte-Carlo codes. We encourage the community to continue developing
theoretical techniques to treat radiative corrections, and perform experimental
tests of these corrections.
| [
{
"created": "Mon, 26 Jun 2023 10:42:24 GMT",
"version": "v1"
}
] | 2023-06-27 | [
[
"Afanasev",
"Andrei",
""
],
[
"Bernauer",
"Jan C.",
""
],
[
"Blunden",
"Peter",
""
],
[
"Blümlein",
"Johannes",
""
],
[
"Cline",
"Ethan W.",
""
],
[
"Friedrich",
"Jan M.",
""
],
[
"Hagelstein",
"Franziska",
... | Radiative corrections are crucial for modern high-precision physics experiments, and are an area of active research in the experimental and theoretical community. Here we provide an overview of the state of the field of radiative corrections with a focus on several topics: lepton-proton scattering, QED corrections in deep-inelastic scattering, and in radiative light-hadron decays. Particular emphasis is placed on the two-photon exchange, believed to be responsible for the proton form-factor discrepancy, and associated Monte-Carlo codes. We encourage the community to continue developing theoretical techniques to treat radiative corrections, and perform experimental tests of these corrections. |
1905.06697 | Rafal Maciula | Rafal Maciula and Antoni Szczurek | Consistent treatment of charm production in higher-orders at tree-level
within $k_T$-factorization approach | 33 pages, 21 figures | Phys. Rev. D 100, 054001 (2019) | 10.1103/PhysRevD.100.054001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss production of $c \bar c$-pairs within $k_T$-factorization approach
(off-shell initial partons) with unintegrated parton distribution functions
(uPDFs). We present a consistent prescription which merges the standard
leading-order (LO) $k_T$-factorization calculations for this process with
tree-level next-to-leading order (NLO) and next-to-next-to-leading order (NNLO)
matrix elements. For the first time we include in this framework 2 $\to$ 3 and
2 $\to$ 4 processes with extra partonic emissions for single particle
distributions as well as for correlation observables. The use of the KMR uPDF
leads to a good description of the existing charm ($D$-meson) data already at
the leading-order. On the other hand, a new Parton-Branching (PB) uPDF strongly
underestimates the same experimental data. A direct inclusion of the
higher-orders at tree-level leads to an overestimation of the data, especially
for the KMR uPDF. This suggests a significant double-counting. We propose a
simple method how to avoid the double-counting. Our procedure leads to a much
better description of the experimental data when including the higher-order
contributions. Then with the KMR uPDF we get similar results (both for single
particle and correlation observables) as for the standard calculations of the 2
$\to$ 2 processes. For the PB uPDF inclusion of the higher-orders considerably
improves description of the experimental data. We conclude that the LO
calculation with the KMR uPDF effectively includes the higher-orders which is
not the case for the PB uPDF.
| [
{
"created": "Thu, 16 May 2019 12:40:59 GMT",
"version": "v1"
}
] | 2019-09-11 | [
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss production of $c \bar c$-pairs within $k_T$-factorization approach (off-shell initial partons) with unintegrated parton distribution functions (uPDFs). We present a consistent prescription which merges the standard leading-order (LO) $k_T$-factorization calculations for this process with tree-level next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) matrix elements. For the first time we include in this framework 2 $\to$ 3 and 2 $\to$ 4 processes with extra partonic emissions for single particle distributions as well as for correlation observables. The use of the KMR uPDF leads to a good description of the existing charm ($D$-meson) data already at the leading-order. On the other hand, a new Parton-Branching (PB) uPDF strongly underestimates the same experimental data. A direct inclusion of the higher-orders at tree-level leads to an overestimation of the data, especially for the KMR uPDF. This suggests a significant double-counting. We propose a simple method how to avoid the double-counting. Our procedure leads to a much better description of the experimental data when including the higher-order contributions. Then with the KMR uPDF we get similar results (both for single particle and correlation observables) as for the standard calculations of the 2 $\to$ 2 processes. For the PB uPDF inclusion of the higher-orders considerably improves description of the experimental data. We conclude that the LO calculation with the KMR uPDF effectively includes the higher-orders which is not the case for the PB uPDF. |
hep-ph/9306222 | Jim Pantaleone | C.J. Horowitz and J. Pantaleone | Long Range Forces from the Cosmological Neutrino Background | 14 pages, LATEX, IUHET-249, IUNTC93-14 | Phys.Lett. B319 (1993) 186-190 | 10.1016/0370-2693(93)90800-W | null | hep-ph astro-ph | null | The cosmological neutrino background will mediate long range forces between
objects. For a background of temperature T, the potential decreases as 1/r^5
for r >> 1/T and as 1/r for r << 1/T. These forces have large spin-dependent
components. If the neutrino background is nonrelativistic, the long range
forces are enhanced by a factor of the inverse neutrino velocity. These long
range forces may provide a method for observing the cosmological neutrino
background.
| [
{
"created": "Thu, 3 Jun 1993 21:51:35 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Horowitz",
"C. J.",
""
],
[
"Pantaleone",
"J.",
""
]
] | The cosmological neutrino background will mediate long range forces between objects. For a background of temperature T, the potential decreases as 1/r^5 for r >> 1/T and as 1/r for r << 1/T. These forces have large spin-dependent components. If the neutrino background is nonrelativistic, the long range forces are enhanced by a factor of the inverse neutrino velocity. These long range forces may provide a method for observing the cosmological neutrino background. |
hep-ph/9908390 | Paolo Gondolo | Paolo Gondolo and Katherine Freese | CP-Violating Effects in Neutralino Scattering and Annihilation | 30 pages, 11 figures | JHEP 0207:052,2002 | 10.1088/1126-6708/2002/07/052 | MPI-PhT/99-35 | hep-ph | null | We show that in some regions of supersymmetric parameter space, CP violating
effects that mix the CP-even and CP-odd Higgs bosons can enhance the neutralino
annihilation rate, and hence the indirect detection rate of neutralino dark
matter, by factors of 10^6. The same CP violating effects can reduce the
neutralino scattering rate off nucleons, and hence the direct detection rate of
neutralino dark matter, by factors of 10^{-7}. We study the dependence of these
effects on the phase of the trilinear coupling A, and find cases in the region
being probed by dark matter searches which are experimentally excluded when CP
is conserved but are allowed when CP is violated.
| [
{
"created": "Tue, 17 Aug 1999 21:37:47 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gondolo",
"Paolo",
""
],
[
"Freese",
"Katherine",
""
]
] | We show that in some regions of supersymmetric parameter space, CP violating effects that mix the CP-even and CP-odd Higgs bosons can enhance the neutralino annihilation rate, and hence the indirect detection rate of neutralino dark matter, by factors of 10^6. The same CP violating effects can reduce the neutralino scattering rate off nucleons, and hence the direct detection rate of neutralino dark matter, by factors of 10^{-7}. We study the dependence of these effects on the phase of the trilinear coupling A, and find cases in the region being probed by dark matter searches which are experimentally excluded when CP is conserved but are allowed when CP is violated. |
hep-ph/9905323 | Vladimir Smirnov | V.A. Smirnov | Analytical Result for Dimensionally Regularized Massless On-shell Double
Box | 8 pages, LaTeX. An error in eq. (24) corrected (8 replaced by 5),
with resulting changes in eqs. (25), (28-30) | Phys.Lett. B460 (1999) 397-404 | 10.1016/S0370-2693(99)00777-7 | null | hep-ph hep-th | null | The dimensionally regularized massless on-shell double box Feynman diagram
with powers of propagators equal to one is analytically evaluated for general
values of the Mandelstam variables s and t. An explicit result is expressed
either in terms of polylogarithms Li_a(-t/s), up to a=4, and generalized
polylogarithms S_{a,b}(-t/s), with a=1,2 and b=2, or in terms of these
functions depending on the inverse ratio, s/t.
| [
{
"created": "Wed, 12 May 1999 16:55:24 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 1999 16:28:47 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Smirnov",
"V. A.",
""
]
] | The dimensionally regularized massless on-shell double box Feynman diagram with powers of propagators equal to one is analytically evaluated for general values of the Mandelstam variables s and t. An explicit result is expressed either in terms of polylogarithms Li_a(-t/s), up to a=4, and generalized polylogarithms S_{a,b}(-t/s), with a=1,2 and b=2, or in terms of these functions depending on the inverse ratio, s/t. |
1006.3929 | Nikolay Volchanskiy | G. Vereshkov and N. Volchanskiy | Symmetries of higher-spin fields and the electromagnetic N-N(1680) form
factors | 11 pp., 2 figs | Phys.Rev.C82:045204,2010 | 10.1103/PhysRevC.82.045204 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Q^2-evolution of the form factors (FFs) for the
nucleon-to-N(1680) transition in the framework of an effective field theory. To
this end, the intrinsic symmetries of the spin-5/2 Rarita-Schwinger (RS) fields
are analyzed, and a Lagrangian of the electromagnetic N-N(1680) interactions is
constructed. The Lagrangian preserves all the intrinsic symmetries of the
spin-5/2 field--point and gauge invariance--and does not involve lower-spin
components of the reducible RS field. Besides, the symmetries postulate the
definitions of the Lagrangian FFs. These FFs are modeled as dispersionlike
expansions in a vector-meson--dominance model. A good agreement with the
experimental data is achieved.
| [
{
"created": "Sun, 20 Jun 2010 11:40:10 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Vereshkov",
"G.",
""
],
[
"Volchanskiy",
"N.",
""
]
] | We study the Q^2-evolution of the form factors (FFs) for the nucleon-to-N(1680) transition in the framework of an effective field theory. To this end, the intrinsic symmetries of the spin-5/2 Rarita-Schwinger (RS) fields are analyzed, and a Lagrangian of the electromagnetic N-N(1680) interactions is constructed. The Lagrangian preserves all the intrinsic symmetries of the spin-5/2 field--point and gauge invariance--and does not involve lower-spin components of the reducible RS field. Besides, the symmetries postulate the definitions of the Lagrangian FFs. These FFs are modeled as dispersionlike expansions in a vector-meson--dominance model. A good agreement with the experimental data is achieved. |
0912.4128 | Keijo Kajantie | J. Alanen, K. Kajantie | Thermodynamics of a field theory with infrared fixed point from
gauge/gravity duality | 10 pages, 4 figures, references and comment on an alternative way of
deriving the phase structure added | Phys.Rev.D81:046003,2010 | 10.1103/PhysRevD.81.046003 | HIP-2009-31/TH | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use gauge/gravity duality to study the thermodynamics of a field theory
with asymptotic freedom in the ultraviolet and a fixed point in the infrared.
We find a high temperature quark-gluon phase and a low T conformal unparticle
phase. The phase transition between the phases is of first order or continuous,
depending on the ratio of the radii of asymptotic AdS5 spaces at T=0 and
T=infinity. This is a prediction from a model of gauge/gravity duality, not yet
verified on the field theory side.
| [
{
"created": "Mon, 21 Dec 2009 10:42:27 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jan 2010 11:37:21 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Alanen",
"J.",
""
],
[
"Kajantie",
"K.",
""
]
] | We use gauge/gravity duality to study the thermodynamics of a field theory with asymptotic freedom in the ultraviolet and a fixed point in the infrared. We find a high temperature quark-gluon phase and a low T conformal unparticle phase. The phase transition between the phases is of first order or continuous, depending on the ratio of the radii of asymptotic AdS5 spaces at T=0 and T=infinity. This is a prediction from a model of gauge/gravity duality, not yet verified on the field theory side. |
1901.04474 | Zhenyang Wang | Zhen-Yang Wang, Jing-Juan Qi, Jing Xu, and Xin-Heng Guo | Analyzing $\Xi(1620)$ in the molecule picture in the Bethe-Salpeter
equation approach | arXiv admin note: text overlap with arXiv:1710.07424 | null | 10.1140/epjc/s10052-019-7135-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we assume that the observed state $\Xi(1620)$ is a $s$-wave
$\Lambda\bar{K}$ or $\Sigma\bar{K}$ bound state. Based on this molecule
picture, we establish the Bethe-Salpeter equations for $\Xi(1620)$ in the
ladder and instantaneous approximations. We solve the Bethe-Salpeter equations
for the $\Lambda\bar{K}$ and $\Sigma\bar{K}$ systems numerically and find that
the $\Xi(1620)$ can be explained as $\Lambda\bar{K}$ and $\Sigma\bar{K}$ bound
states with $J^P=1/2^-$, respectively. Then we calculate the decay widths of
$\Xi(1620)\rightarrow\Xi\pi$ in these two different molecule pictures systems,
respectively.
| [
{
"created": "Sun, 13 Jan 2019 08:59:39 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 01:45:03 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Wang",
"Zhen-Yang",
""
],
[
"Qi",
"Jing-Juan",
""
],
[
"Xu",
"Jing",
""
],
[
"Guo",
"Xin-Heng",
""
]
] | In this work, we assume that the observed state $\Xi(1620)$ is a $s$-wave $\Lambda\bar{K}$ or $\Sigma\bar{K}$ bound state. Based on this molecule picture, we establish the Bethe-Salpeter equations for $\Xi(1620)$ in the ladder and instantaneous approximations. We solve the Bethe-Salpeter equations for the $\Lambda\bar{K}$ and $\Sigma\bar{K}$ systems numerically and find that the $\Xi(1620)$ can be explained as $\Lambda\bar{K}$ and $\Sigma\bar{K}$ bound states with $J^P=1/2^-$, respectively. Then we calculate the decay widths of $\Xi(1620)\rightarrow\Xi\pi$ in these two different molecule pictures systems, respectively. |
2406.12518 | Indra Kumar Banerjee | Indra Kumar Banerjee, Ujjal Kumar Dey, Shaaban Khalil | Primordial Black Holes and Gravitational Waves in the $U(1)_{B-L}$
Extended Inert Doublet Model: A First-Order Phase Transition Perspective | 22 pages, 10 figures, 3 tables | null | null | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conduct an analysis of a $U(1)_{B-L}$ extended inert doublet model and
obtained the parameter space allowing strong first order phase transitions. We
show that a large part of the parameter space can cause double first-order
phase transitions. Whereas both of these phase transitions can generate a
detectable stochastic gravitational wave background, one of them can create
primordial black holes with appreciable abundance. The primordial black holes
generated at the high scale transition can account for the dark matter
maintaining the correct relic abundance. We also show specific benchmark cases
and their consequences from the aspect of primordial black holes and
gravitational waves.
| [
{
"created": "Tue, 18 Jun 2024 11:45:51 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Banerjee",
"Indra Kumar",
""
],
[
"Dey",
"Ujjal Kumar",
""
],
[
"Khalil",
"Shaaban",
""
]
] | We conduct an analysis of a $U(1)_{B-L}$ extended inert doublet model and obtained the parameter space allowing strong first order phase transitions. We show that a large part of the parameter space can cause double first-order phase transitions. Whereas both of these phase transitions can generate a detectable stochastic gravitational wave background, one of them can create primordial black holes with appreciable abundance. The primordial black holes generated at the high scale transition can account for the dark matter maintaining the correct relic abundance. We also show specific benchmark cases and their consequences from the aspect of primordial black holes and gravitational waves. |
1705.04878 | Gouranga Nayak | Gouranga C Nayak | Jet Quenching at RHIC and LHC and the Fragmentation Function in Vacuum | 18 pages latex | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The value of the parton to hadron fragmentation function in QCD in vacuum
(for example from proton-proton collisions at high energy colliders) is
directly/indirectly used in the literature to study the jet quenching and the
hadron production from quark-gluon plasma at RHIC and LHC. In this paper we
show that this is not possible because, unlike the perturbative propagator in
non-equilibrium QCD, the parton to hadron fragmentation function is a
non-perturbative quantity in QCD and hence it is not possible to decompose the
fragmentation function in non-equilibrium QCD into the vacuum part and the
medium part.
| [
{
"created": "Sat, 13 May 2017 19:30:43 GMT",
"version": "v1"
}
] | 2017-05-18 | [
[
"Nayak",
"Gouranga C",
""
]
] | The value of the parton to hadron fragmentation function in QCD in vacuum (for example from proton-proton collisions at high energy colliders) is directly/indirectly used in the literature to study the jet quenching and the hadron production from quark-gluon plasma at RHIC and LHC. In this paper we show that this is not possible because, unlike the perturbative propagator in non-equilibrium QCD, the parton to hadron fragmentation function is a non-perturbative quantity in QCD and hence it is not possible to decompose the fragmentation function in non-equilibrium QCD into the vacuum part and the medium part. |
hep-ph/0308170 | Orhan Cakir | E. Arik (Bogazici Univ., Istanbul, Turkey), O. Cakir (Ankara Univ.,
Ankara, Turkey), S. Sultansoy (Gazi Univ., Ankara, Turkey and Institute of
Physics, Baku, Azerbaijan) | A search for the fourth SM family quarks at Tevatron | 7 pages, 2 tables, 4 figures | Eur.Phys.J. C39 (2005) 499-501 | 10.1140/epjc/s2004-02110-2 | null | hep-ph | null | It is shown that the fourth standard model (SM) family quarks can be observed
at the Fermilab Tevatron if their anomalous interactions with known quarks have
sufficient strength.
| [
{
"created": "Sun, 17 Aug 2003 21:39:47 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2004 11:36:00 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jun 2004 12:57:51 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Arik",
"E.",
"",
"Bogazici Univ., Istanbul, Turkey"
],
[
"Cakir",
"O.",
"",
"Ankara Univ.,\n Ankara, Turkey"
],
[
"Sultansoy",
"S.",
"",
"Gazi Univ., Ankara, Turkey and Institute of\n Physics, Baku, Azerbaijan"
]
] | It is shown that the fourth standard model (SM) family quarks can be observed at the Fermilab Tevatron if their anomalous interactions with known quarks have sufficient strength. |
1207.0380 | David Winn | Peter Richardson and David Winn | Investigation of Monte Carlo Uncertainties on Higgs Boson searches using
Jet Substructure | 23 pages v2: Minor typos fixed | null | 10.1140/epjc/s10052-012-2178-8 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an investigation of the dependence of searches for boosted Higgs
bosons using jet substructure on the perturbative and non-perturbative
parameters of the Herwig++ Monte Carlo event generator. Values are presented
for a new tune of the parameters of the event generator, together with the an
estimate of the uncertainties based on varying the parameters around the
best-fit values.
| [
{
"created": "Mon, 2 Jul 2012 13:36:02 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jul 2012 13:36:59 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Richardson",
"Peter",
""
],
[
"Winn",
"David",
""
]
] | We present an investigation of the dependence of searches for boosted Higgs bosons using jet substructure on the perturbative and non-perturbative parameters of the Herwig++ Monte Carlo event generator. Values are presented for a new tune of the parameters of the event generator, together with the an estimate of the uncertainties based on varying the parameters around the best-fit values. |
hep-ph/0610271 | Gabriel Sanchez-Colon | Gabriel Sanchez-Colon (1) and Augusto Garcia (2) ((1) CINVESTAV Unidad
Merida; Merida, Yucatan, MEXICO. (2) CINVESTAV; Mexico, D.F., MEXICO) | Mirror matter admixtures in K_S to gamma gamma | null | Int.J.Mod.Phys.A21:4197-4207,2006 | 10.1142/S0217751X06031648 | null | hep-ph | null | The latest measurement of the K_S to gamma gamma branching ratio clearly
shows an enhancement over the current theoretical prediction. As in other K and
B meson decays, this invites to consider the possibility of the contribution of
new physics. We study a particular form of the latter, which may be referred to
as manifest mirror symmetry. The experimental data are described using
previously determined values for the mixing angles of the admixtures of mirror
matter in ordinary hadrons and by assuming that for pi^0, eta, eta', the mirror
decay amplitudes have the same magnitudes as their ordinary counterparts.
| [
{
"created": "Fri, 20 Oct 2006 17:01:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sanchez-Colon",
"Gabriel",
""
],
[
"Garcia",
"Augusto",
""
]
] | The latest measurement of the K_S to gamma gamma branching ratio clearly shows an enhancement over the current theoretical prediction. As in other K and B meson decays, this invites to consider the possibility of the contribution of new physics. We study a particular form of the latter, which may be referred to as manifest mirror symmetry. The experimental data are described using previously determined values for the mixing angles of the admixtures of mirror matter in ordinary hadrons and by assuming that for pi^0, eta, eta', the mirror decay amplitudes have the same magnitudes as their ordinary counterparts. |
hep-ph/9409308 | Klaus Kinder-Geiger | K. Geiger | Effective Field Theory Approach to Parton-Hadron Conversion in High
Energy QCD Processes | CERN-TH. 7440/94, 34 pages, 10 figures, Latex file plus figures
encoded with uufiles | Phys.Rev. D51 (1995) 3669-3687 | 10.1103/PhysRevD.51.3669 | null | hep-ph | null | A QCD based effective action is constructed to describe the dynamics of
confinement and symmetry breaking in the process of parton-hadron conversion.
The deconfined quark and gluon degrees of freedom of the perturbative QCD
vacuum are coupled to color singlet collective fields representing the
non-perturbative vacuum with broken scale and chiral symmetry. The effective
action recovers QCD with its scale and chiral symmetry properties at short
space-time distances, but yields at large distances (r > 1 fm) to the formation
of symmetry breaking gluon and quark condensates. The approach is applied to
the evolution of a fragmenting $q\bar q$ pair with its generated gluon
distribution, starting from a large hard scale $Q^2$. The modification of the
gluon distribution arising from the coupling to the non-perturbative collective
field results eventually in a complete condensation of gluons. Color flux tube
configurations of the gluons in between the $q\bar q$ pair are obtained as
solutions of the equations of motion. With reasonable parameter choice, the
associated energy per unit length (string tension) comes out $\simeq 1$ GeV/fm,
consistent with common estimates.
| [
{
"created": "Wed, 14 Sep 1994 17:47:23 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Geiger",
"K.",
""
]
] | A QCD based effective action is constructed to describe the dynamics of confinement and symmetry breaking in the process of parton-hadron conversion. The deconfined quark and gluon degrees of freedom of the perturbative QCD vacuum are coupled to color singlet collective fields representing the non-perturbative vacuum with broken scale and chiral symmetry. The effective action recovers QCD with its scale and chiral symmetry properties at short space-time distances, but yields at large distances (r > 1 fm) to the formation of symmetry breaking gluon and quark condensates. The approach is applied to the evolution of a fragmenting $q\bar q$ pair with its generated gluon distribution, starting from a large hard scale $Q^2$. The modification of the gluon distribution arising from the coupling to the non-perturbative collective field results eventually in a complete condensation of gluons. Color flux tube configurations of the gluons in between the $q\bar q$ pair are obtained as solutions of the equations of motion. With reasonable parameter choice, the associated energy per unit length (string tension) comes out $\simeq 1$ GeV/fm, consistent with common estimates. |
hep-ph/0206123 | Gregory Gabadadze | Gregory Gabadadze, M. Shifman | QCD Vacuum and Axions: What's Happening? | 43 pages; An expanded version of a review talk given by G.G. at
``Continuous Advances in QCD 2002/Arkadyfest'', honoring the 60'th birthday
of Arkady Vainshtein, Minneapolis, May 17 - 23, 2002 | Int.J.Mod.Phys. A17 (2002) 3689-3728 | 10.1142/S0217751X02011357 | TPI-MINN-02/19, UMN-TH-2104/02 | hep-ph hep-th | null | A deeper understanding of the vacuum structure in QCD invites one to rethink
certain aspects of the axion physics. The recent advances are mostly due to
developments in supersymmetric gauge theories and the brane theory, in which
QCD can be embedded. They include, but are not limited to, the studies of
metastable vacua in multicolor gluodynamics, and the domain walls. We briefly
review basics of the axion physics and then present a modern perspective on a
rich interplay between the QCD vacuum structure and axion physics.
| [
{
"created": "Thu, 13 Jun 2002 23:13:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gabadadze",
"Gregory",
""
],
[
"Shifman",
"M.",
""
]
] | A deeper understanding of the vacuum structure in QCD invites one to rethink certain aspects of the axion physics. The recent advances are mostly due to developments in supersymmetric gauge theories and the brane theory, in which QCD can be embedded. They include, but are not limited to, the studies of metastable vacua in multicolor gluodynamics, and the domain walls. We briefly review basics of the axion physics and then present a modern perspective on a rich interplay between the QCD vacuum structure and axion physics. |
0905.4239 | Nicolas Bernal Dr. | Nicolas Bernal | Dark matter direct detection in the MSSM with heavy scalars | 20 pages, 10 figures | JCAP 0908:022,2009 | 10.1088/1475-7516/2009/08/022 | UB-ECM-PF-09/14, ICCUB-09-205 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the dark matter detection prospects in the Minimal Supersymmetric
Standard Model in the scenario where the scalar partners of the fermions and
the Higgs particles (except for the Standard-Model-like one) are assumed to be
very heavy and are removed from the low-energy spectrum. We analyse the
neutralino LSP ($\chi_1^0$) in scenarios where the gaugino mass parameters are
universal at the GUT scale and also the case where they are non-universal. This
analysis is carried out in the framework of a Xenon-like 100 kg experiment. In
general, an important fraction of the parameter space giving rise to the dark
matter relic density measured by WMAP can be probed and excluded in the case of
not detecting any WIMP. In the opposite case, once a WIMP signal has been
found, we show that for a light $\chi_1^0$ which is a higgsino-gaugino mixture
it is possible to reconstruct efficiently the mass and the scattering
cross-section of the neutralino LSP. Moreover, we show that it is also feasible
to put strong constraints over some of the parameters of the Lagrangian, e.g.
the higgsino and the gaugino mass parameters.
| [
{
"created": "Tue, 26 May 2009 17:40:44 GMT",
"version": "v1"
}
] | 2009-08-24 | [
[
"Bernal",
"Nicolas",
""
]
] | We explore the dark matter detection prospects in the Minimal Supersymmetric Standard Model in the scenario where the scalar partners of the fermions and the Higgs particles (except for the Standard-Model-like one) are assumed to be very heavy and are removed from the low-energy spectrum. We analyse the neutralino LSP ($\chi_1^0$) in scenarios where the gaugino mass parameters are universal at the GUT scale and also the case where they are non-universal. This analysis is carried out in the framework of a Xenon-like 100 kg experiment. In general, an important fraction of the parameter space giving rise to the dark matter relic density measured by WMAP can be probed and excluded in the case of not detecting any WIMP. In the opposite case, once a WIMP signal has been found, we show that for a light $\chi_1^0$ which is a higgsino-gaugino mixture it is possible to reconstruct efficiently the mass and the scattering cross-section of the neutralino LSP. Moreover, we show that it is also feasible to put strong constraints over some of the parameters of the Lagrangian, e.g. the higgsino and the gaugino mass parameters. |
1912.10613 | Tanmoy Modak | Dilip Kumar Ghosh, Wei-Shu Hou, Tanmoy Modak | Sub-TeV $H^+$ Boson Production as Probe of Extra Top Yukawa Couplings | matches the published version | Phys.Rev.Lett. 125 (2020), 221801 | 10.1103/PhysRevLett.125.221801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest searching for the charged Higgs boson at the Large Hadron Collider
(LHC) via $cg \to b H^+ \to b t \bar b$. In the general two Higgs Doublet
Model, extra top Yukawa couplings $\rho_{tc}$ and $\rho_{tt}$ can drive the
disappearance of antimatter from the Universe, while $\bar cbH^+$ and $\bar
tbH^+$ couple with strength $\rho_{tc}V_{tb}$ and $\rho_{tt}V_{tb}$,
respectively. For $\rho_{tc},\, \rho_{tt} \sim 0.5$ and $m_{H^+} \sim 300$--500
GeV, evidence could emerge from LHC Run 2 data at hand, and discovery by adding
Run 3 data in the near future.
| [
{
"created": "Mon, 23 Dec 2019 04:00:10 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2020 10:24:09 GMT",
"version": "v2"
}
] | 2020-11-30 | [
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Hou",
"Wei-Shu",
""
],
[
"Modak",
"Tanmoy",
""
]
] | We suggest searching for the charged Higgs boson at the Large Hadron Collider (LHC) via $cg \to b H^+ \to b t \bar b$. In the general two Higgs Doublet Model, extra top Yukawa couplings $\rho_{tc}$ and $\rho_{tt}$ can drive the disappearance of antimatter from the Universe, while $\bar cbH^+$ and $\bar tbH^+$ couple with strength $\rho_{tc}V_{tb}$ and $\rho_{tt}V_{tb}$, respectively. For $\rho_{tc},\, \rho_{tt} \sim 0.5$ and $m_{H^+} \sim 300$--500 GeV, evidence could emerge from LHC Run 2 data at hand, and discovery by adding Run 3 data in the near future. |
1507.02644 | Hong-Jian He | Lan-Chun L\"u, Chun Du, Yaquan Fang, Hong-Jian He, Huijun Zhang | Searching for Heavier Higgs Boson via Di-Higgs Production at LHC Run-2 | Phys.Lett.B Final Version. 16pp (9 Figs + 4 Tables). Only minor
refinements, references added | Physics Letters B 755 (2016) 509-522 | 10.1016/j.physletb.2016.02.026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC discovery of a light Higgs particle $h^0$ (125GeV) opens up new
prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will
unambiguously point to new physics beyond the standard model (SM). We study the
detection of a heavier neutral Higgs boson $H^0$ via di-Higgs production
channel at the LHC (14TeV), $H^0 \to h^0h^0 \to WW^*\gamma\gamma$. This
directly probes the $Hhh$ cubic Higgs interaction, which exists in most
extensions of the SM Higgs sector. For the decay products of final states
$WW^*$, we include both pure leptonic mode $WW^* \to
\ell\bar{\nu}\bar{\ell}\nu$ and semi-leptonic mode $WW^* \to q\bar{q}'\ell\nu$.
We analyze signals and backgrounds by performing fast detector simulation for
the full processes $pp \to H \to hh \to WW^*\gamma\gamma \to
\ell\bar{\nu}\bar{\ell}\nu\gamma\gamma$ and $pp \to H \to hh \to
WW^*\gamma\gamma \to \ell\nu q\bar{q}'\gamma\gamma$, over the mass range
$M_H=250-600$GeV. For generic two-Higgs-doublet models (2HDM), we present the
discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it
with the current Higgs global fit of the 2HDM parameter space.
| [
{
"created": "Thu, 9 Jul 2015 18:39:40 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2015 17:51:04 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Feb 2016 17:05:40 GMT",
"version": "v3"
},
{
"created": "Wed, 17 Feb 2016 16:29:52 GMT",
"version": "v4"
}
] | 2016-03-23 | [
[
"Lü",
"Lan-Chun",
""
],
[
"Du",
"Chun",
""
],
[
"Fang",
"Yaquan",
""
],
[
"He",
"Hong-Jian",
""
],
[
"Zhang",
"Huijun",
""
]
] | The LHC discovery of a light Higgs particle $h^0$ (125GeV) opens up new prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will unambiguously point to new physics beyond the standard model (SM). We study the detection of a heavier neutral Higgs boson $H^0$ via di-Higgs production channel at the LHC (14TeV), $H^0 \to h^0h^0 \to WW^*\gamma\gamma$. This directly probes the $Hhh$ cubic Higgs interaction, which exists in most extensions of the SM Higgs sector. For the decay products of final states $WW^*$, we include both pure leptonic mode $WW^* \to \ell\bar{\nu}\bar{\ell}\nu$ and semi-leptonic mode $WW^* \to q\bar{q}'\ell\nu$. We analyze signals and backgrounds by performing fast detector simulation for the full processes $pp \to H \to hh \to WW^*\gamma\gamma \to \ell\bar{\nu}\bar{\ell}\nu\gamma\gamma$ and $pp \to H \to hh \to WW^*\gamma\gamma \to \ell\nu q\bar{q}'\gamma\gamma$, over the mass range $M_H=250-600$GeV. For generic two-Higgs-doublet models (2HDM), we present the discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it with the current Higgs global fit of the 2HDM parameter space. |
1102.2031 | Rumin Wang | Ru-Min Wang, Yuan-Guo Xu, Qin Chang, Ya-Dong Yang | Studying of B_s^0-\bar{B}_s^0 mixing and B_{s}\to K^{(*)-}K^{(*)+}
decays within supersymmetry | 28 pages and 9 figures, published version, 3 figures added | Phys.Rev.D83:095010,2011 | 10.1103/PhysRevD.83.095010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results from CDF and D{\O} collaborations favor a large CP asymmetry
in B_s^0-\bar{B}_s^0 mixing, while the standard model prediction is very small.
Such a large phase may imply sizable new physics effects in B_s^0-\bar{B}_s^0
mixing. We compute the gluino-mediated supersymmetry contributions to
B_s^0-\bar{B}_s^0 mixing, B_s->K^{(*)-}K^{(*)+} and B->X_s\gamma decays in the
frame of the mass insertion approximation. Combining the constraints of
\DeltaM_s, \Delta\Gamma_s, \phi^{J/\psi\phi}_s, B(B_s->K^{-}K^{+}) and B(B->X_s
\gamma), we find that the effects of the constrained LL and RR insertions in
B_s->K^{(*)-}K^{(*)+} decays are small because of the absence of gluino mass
enhancement. For m^2_{\tilde{g}}/m^2_{\tilde{q}}=9, the constrained LR
insertion can provide sizable contributions to all observables of
B_s->K^{(*)-}K^{(*)+} decays except A^{dir}_{CP}(B_s->K^{-}K^{+}), and many
observables are sensitive to the modulus and the phase of the LR insertion
parameter. Near future experiments at Fermilab Tevatron and CERN LHC-b can test
these predictions and shrink/reveal the mass insertion parameter spaces.
| [
{
"created": "Thu, 10 Feb 2011 03:59:11 GMT",
"version": "v1"
},
{
"created": "Sat, 21 May 2011 03:38:31 GMT",
"version": "v2"
}
] | 2011-06-02 | [
[
"Wang",
"Ru-Min",
""
],
[
"Xu",
"Yuan-Guo",
""
],
[
"Chang",
"Qin",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | Recent results from CDF and D{\O} collaborations favor a large CP asymmetry in B_s^0-\bar{B}_s^0 mixing, while the standard model prediction is very small. Such a large phase may imply sizable new physics effects in B_s^0-\bar{B}_s^0 mixing. We compute the gluino-mediated supersymmetry contributions to B_s^0-\bar{B}_s^0 mixing, B_s->K^{(*)-}K^{(*)+} and B->X_s\gamma decays in the frame of the mass insertion approximation. Combining the constraints of \DeltaM_s, \Delta\Gamma_s, \phi^{J/\psi\phi}_s, B(B_s->K^{-}K^{+}) and B(B->X_s \gamma), we find that the effects of the constrained LL and RR insertions in B_s->K^{(*)-}K^{(*)+} decays are small because of the absence of gluino mass enhancement. For m^2_{\tilde{g}}/m^2_{\tilde{q}}=9, the constrained LR insertion can provide sizable contributions to all observables of B_s->K^{(*)-}K^{(*)+} decays except A^{dir}_{CP}(B_s->K^{-}K^{+}), and many observables are sensitive to the modulus and the phase of the LR insertion parameter. Near future experiments at Fermilab Tevatron and CERN LHC-b can test these predictions and shrink/reveal the mass insertion parameter spaces. |
hep-ph/0005070 | Vicente Pleitez | J. C. Montero and V. Pleitez | MSW effect with flavor changing interactions and the atmospheric
neutrino problem | RevTex, 9 pages, 3 .eps figures | null | null | IFT-P.047/2000 | hep-ph | null | We consider flavor changing effective neutrino interactions in the context of
massive neutrinos in the issue of atmospheric neutrinos. Assuming as usual that
this is an indication of the oscillation of muon neutrinos into tau neutrinos
we show that there is a set of parameters which is consistent with the MSW
resonance condition for the typical Earth density and atmospheric neutrino
energies. In particular we show that even if the vacuum mixing angle vanishes
it is still possible to have a resonance which is compatible with the
atmospheric neutrino data. We also briefly consider the case of the solar
neutrino problem.
| [
{
"created": "Mon, 8 May 2000 19:37:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Montero",
"J. C.",
""
],
[
"Pleitez",
"V.",
""
]
] | We consider flavor changing effective neutrino interactions in the context of massive neutrinos in the issue of atmospheric neutrinos. Assuming as usual that this is an indication of the oscillation of muon neutrinos into tau neutrinos we show that there is a set of parameters which is consistent with the MSW resonance condition for the typical Earth density and atmospheric neutrino energies. In particular we show that even if the vacuum mixing angle vanishes it is still possible to have a resonance which is compatible with the atmospheric neutrino data. We also briefly consider the case of the solar neutrino problem. |
1904.08718 | Mohammad Moosavi Nejad | Maral Salajegheh, S. Mohammad Moosavi Nejad, Hamzeh Khanpour, Bernd A.
Kniehl, Maryam Soleymaninia | $B$-hadron fragmentation functions at next-to-next-to-leading order from
global analysis of $e^+e^-$ annihilation data | Accepted by Physical Review D | Phys. Rev. D 99, 114001 (2019) | 10.1103/PhysRevD.99.114001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present nonperturbative fragmentation functions (FFs) for bottom-flavored
($B$) hadrons both at next-to-leading (NLO) and, for the first time, at
next-to-next-to-leading order (NNLO) in the $\overline{\mathrm{MS}}$
factorization scheme with five massless quark flavors. They are determined by
fitting all available experimental data of inclusive single $B$-hadron
production in $e^+e^-$ annihilation, from the ALEPH, DELPHI, and OPAL
Collaborations at CERN LEP1 and the SLD Collaboration at SLAC SLC.
The uncertainties in these FFs as well as in the corresponding observables
are estimated using the Hessian approach.
We perform comparisons with available NLO sets of $B$-hadron FFs.
We apply our new FFs to generate theoretical predictions for the energy
distribution of $B$ hadrons produced through the decay of unpolarized or
polarized top quarks, to be measured at the CERN LHC.
| [
{
"created": "Thu, 18 Apr 2019 12:11:40 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 2019 08:01:58 GMT",
"version": "v2"
}
] | 2019-06-12 | [
[
"Salajegheh",
"Maral",
""
],
[
"Nejad",
"S. Mohammad Moosavi",
""
],
[
"Khanpour",
"Hamzeh",
""
],
[
"Kniehl",
"Bernd A.",
""
],
[
"Soleymaninia",
"Maryam",
""
]
] | We present nonperturbative fragmentation functions (FFs) for bottom-flavored ($B$) hadrons both at next-to-leading (NLO) and, for the first time, at next-to-next-to-leading order (NNLO) in the $\overline{\mathrm{MS}}$ factorization scheme with five massless quark flavors. They are determined by fitting all available experimental data of inclusive single $B$-hadron production in $e^+e^-$ annihilation, from the ALEPH, DELPHI, and OPAL Collaborations at CERN LEP1 and the SLD Collaboration at SLAC SLC. The uncertainties in these FFs as well as in the corresponding observables are estimated using the Hessian approach. We perform comparisons with available NLO sets of $B$-hadron FFs. We apply our new FFs to generate theoretical predictions for the energy distribution of $B$ hadrons produced through the decay of unpolarized or polarized top quarks, to be measured at the CERN LHC. |
hep-ph/0109088 | Tobias Hurth | A.S. Dighe (MPI Munich), T. Hurth (CERN), C.S. Kim (Yonsei) and T.
Yoshikawa (Chapel Hill) | Measurement of the Lifetime Difference of $B_d$ Mesons: Possible and
Worthwhile? | latex, 31 pages, revised version | Nucl.Phys.B624:377-404,2002 | 10.1016/S0550-3213(01)00655-1 | CERN-TH/2001-200, IFP-796-UNC, MPI-PhT/2001-27 | hep-ph hep-ex | null | We estimate the decay width difference $\Delta Gamma_d / \Gamma_d$ in the
$B_d$ system including $1/m_b$ contributions and next-to-leading order QCD
corrections, and find it to be around 0.3%. We explicitly show that the time
measurements of an untagged $B_d$ decaying to a single final state
isotropically can only be sensitive to quadratic terms in $\Delta Gamma_d /
\Gamma_d$, and hence the use of at least two different final states is desired.
We discuss such pairs of candidate decay channels for the final states and
explore the feasibility of a $\Delta Gamma_d / \Gamma_d$ measurement through
them. The measurement of this width difference is essential for an accurate
measurement of $\sin(2\beta)$ at the LHC. The nonzero width difference may also
be used to identify new physics effects and to resolve a twofold discrete
ambiguity in the $B_d$-$\bar{B}_d$ mixing phase. We also derive an upper bound
on the value of $\Delta Gamma_d / \Gamma_d$ in the presence of new physics, and
point out some differences in the phenomenology of width differences in the
$B_s$ and $B_d$ systems.
| [
{
"created": "Tue, 11 Sep 2001 19:59:58 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2001 20:24:24 GMT",
"version": "v2"
}
] | 2011-01-27 | [
[
"Dighe",
"A. S.",
"",
"MPI Munich"
],
[
"Hurth",
"T.",
"",
"CERN"
],
[
"Kim",
"C. S.",
"",
"Yonsei"
],
[
"Yoshikawa",
"T.",
"",
"Chapel Hill"
]
] | We estimate the decay width difference $\Delta Gamma_d / \Gamma_d$ in the $B_d$ system including $1/m_b$ contributions and next-to-leading order QCD corrections, and find it to be around 0.3%. We explicitly show that the time measurements of an untagged $B_d$ decaying to a single final state isotropically can only be sensitive to quadratic terms in $\Delta Gamma_d / \Gamma_d$, and hence the use of at least two different final states is desired. We discuss such pairs of candidate decay channels for the final states and explore the feasibility of a $\Delta Gamma_d / \Gamma_d$ measurement through them. The measurement of this width difference is essential for an accurate measurement of $\sin(2\beta)$ at the LHC. The nonzero width difference may also be used to identify new physics effects and to resolve a twofold discrete ambiguity in the $B_d$-$\bar{B}_d$ mixing phase. We also derive an upper bound on the value of $\Delta Gamma_d / \Gamma_d$ in the presence of new physics, and point out some differences in the phenomenology of width differences in the $B_s$ and $B_d$ systems. |
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